FRONIUS

Fronius Solar Batteries, Hybrid Inverters & Energy Storage – European B2B Supply

Fronius is an Austrian manufacturer of photovoltaic inverters, hybrid energy storage systems, solar batteries, energy management technology and intelligent EV charging solutions for residential, commercial and industrial applications.

With more than three decades of experience in solar energy technology, Fronius develops integrated solutions for generating, storing, monitoring and using photovoltaic electricity.

The manufacturer’s portfolio includes Fronius GEN24, GEN24 Plus, Verto, Verto Plus, Reserva, Reserva Pro, Tauro, Argeno, Wattpilot, Ohmpilot and Fronius Solar.web.

At 3Buy Solar, we supply professional solar installers, EPC contractors, electrical contractors, energy storage integrators and resellers across Europe with selected Fronius battery systems and related photovoltaic equipment.

Our published Fronius catalogue includes modular Reserva high-voltage batteries from 6.3kWh to 15.8kWh, larger Reserva Pro battery systems from 11.9kWh to 31.9kWh, individual battery modules and the corresponding battery management equipment.

For Fronius hybrid inverters, commercial string inverters, EV charging, energy management accessories or complete system requirements, professional buyers can submit a project-specific B2B quotation request.

Shop Fronius Products at 3Buy Solar

• Fronius Reserva Batteries – 6.3–15.8kWh
• Fronius Reserva Pro Batteries – 11.9–31.9kWh
• Solar Batteries & Energy Storage
• Hybrid Solar Inverters
• Battery BMS & Controllers
• Commercial & Industrial Energy Storage
• Complete Solar PV Kits

Individual battery products are available for ordering or backordering according to their current product-page status. Fronius inverter and accessory availability should be confirmed separately.

Request Fronius B2B Pricing, Technical Product Selection & EU Delivery

Fronius Product Range – Which Inverter or Energy Storage System Fits Your Project?

Fronius develops several distinct technology platforms for photovoltaic generation, battery storage, backup electricity, energy management and electrical mobility.

The correct system depends on the electrical network, installed solar PV capacity, required battery storage, backup expectations and project application.

Fronius Product Comparison – Professional Selection Guide

These product families do not provide identical functionality.

In particular, Verto is a conventional grid-connected inverter, whereas Verto Plus is the hybrid model with an approved battery interface.

Likewise, a Reserva battery module is not interchangeable with a Reserva Pro battery module.

Professional system procurement must therefore use exact manufacturer models and approved combinations.

Buy Fronius Reserva Solar Batteries – 6.3kWh to 15.8kWh

The Fronius Reserva is a modular high-voltage LiFePO4 battery system developed for compatible Fronius hybrid inverter installations.

It provides DC-coupled photovoltaic energy storage for residential self-consumption, load shifting and supported backup applications.

The system uses battery modules of approximately 3.15kWh each.

A complete Reserva tower contains between two and five modules.

Fronius Reserva Technical Comparison

Usable energy and voltage values are taken from Fronius’s current manufacturer specifications.

Fronius Reserva 6.3kWh – Residential Battery Storage

Buy Fronius Reserva 6.3kWh High-Voltage Battery Set

The Reserva 6.3 provides 6.31kWh of usable battery storage using two battery modules.

It is relevant to residential installations requiring a smaller initial energy storage configuration.

The manufacturer lists compatibility with appropriately configured Primo GEN24 Plus, Symo GEN24 Plus and Verto Plus systems, subject to the exact model and certification.

The listed 3Buy Solar set specifies two battery modules, BMS and system base.

Fronius Reserva 9.5kWh – Modular Residential ESS

Buy Fronius Reserva 9.5kWh High-Voltage Battery Set

The Reserva 9.5 uses three battery modules and provides 9.47kWh of usable energy.

It is relevant for residential solar installations requiring additional energy storage for evening consumption, suitable backup loads and higher self-consumption.

The manufacturer lists it as compatible with approved Primo GEN24 Plus, Symo GEN24 Plus and Verto Plus inverter configurations.

Fronius Reserva 12.6kWh – Four-Module Battery System

Buy Fronius Reserva 12.6kWh High-Voltage Battery Set

This configuration uses four battery modules, providing 12.63kWh of usable storage.

It is suitable for approved Fronius hybrid systems requiring larger battery capacity.

Important inverter limitation: Reserva 12.6 is supported by Primo GEN24 Plus SC, but not by the standard Primo GEN24 Plus without SC, according to the manufacturer’s compatibility matrix.

It is also listed for compatible Symo GEN24 Plus and Verto Plus systems.

Fronius Reserva 15.8kWh – Five-Module Battery System

Buy Fronius Reserva 15.8kWh High-Voltage Battery Set

The Reserva 15.8 provides 15.79kWh of usable energy using five modules.

It is the highest-capacity single-tower configuration in the standard Reserva family.

The manufacturer lists compatibility with Symo GEN24 Plus and Verto Plus systems.

Reserva 15.8 is not listed as compatible with either Primo GEN24 Plus variant.

Fronius Reserva – Main Technical Characteristics

• High-voltage battery architecture
• Lithium iron phosphate chemistry
• Two to five modules per tower
• 6.31–15.79kWh usable energy
• Up to 32A maximum battery output current
• IP65 enclosure protection
• Modbus RS485 communication
• Supported indoor and protected outdoor installation
• Modular battery expansion
• Up to four towers in approved parallel configurations
• Monitoring through compatible Fronius inverters and Solar.web
• Manufacturer-stated ten-year warranty
• Integration with suitable backup systems

How Much Can Fronius Reserva Be Expanded?

The manufacturer’s maximum configuration permits four Reserva 15.8 towers in parallel.

This provides approximately:

4 × 15.79kWh = 63.16kWh usable energy.

However, the maximum installed energy capacity does not determine the maximum inverter output.

Critical Battery Power Limitation

Fronius specifies that the standard Reserva system is limited to 32A maximum output current, even when several Reserva towers are connected in parallel.

For example, the manufacturer’s documentation explains that connecting four 15.8kWh towers to a compatible Verto Plus does not automatically increase the available battery current.

This is important for professional installers designing high-power backup systems.

If the project requires greater battery discharge power, Reserva Pro may offer a more appropriate architecture.

Official technical reference: Fronius Reserva – Specifications, Installation Documents & Warranty

Fronius Reserva Battery Modules & BMS – Individual Components

3Buy Solar also lists separate Fronius Reserva components.

These are relevant to new installations, approved battery expansion and replacement requirements.

Fronius Reserva 3.15kWh Battery Module

Fronius Reserva 3.15kWh High-Voltage Battery Module

The module forms part of the manufacturer’s modular high-voltage battery platform.

It cannot operate as an independent battery energy storage system.

A complete approved arrangement requires the necessary number of modules, suitable battery management equipment and a compatible inverter.

Fronius Reserva BMS

Fronius Reserva Battery Management System

The BMS coordinates the battery’s approved monitoring, protection and communication functions.

The battery management equipment is not a substitute for the inverter or the other system components.

Can One Reserva Module Be Connected to an Inverter?

No.

The standard Reserva system requires a minimum of two battery modules per approved tower.

A standalone 3.15kWh module should not be marketed as a complete compatible battery solution.

Can a Reserva Battery Be Expanded from 6.3kWh to 15.8kWh?

Supported expansion is possible through additional modules within the manufacturer-approved configuration.

Installers must follow the current instructions concerning module installation, electrical connection, firmware and system commissioning.

Battery expansion should not be treated as a simple mechanical operation without completing the required compatibility and safety checks.

Fronius Reserva Pro – 11.9kWh to 31.9kWh High-Voltage Battery Storage

The Fronius Reserva Pro is the manufacturer’s larger modular high-voltage energy storage system for buildings with higher electrical consumption.

Introduced in 2026, Reserva Pro is intended for applications including:

• Larger residential properties
• Commercial buildings
• Agricultural installations
• Workshops
• Small and medium-sized enterprises
• Higher-power hybrid PV systems
• Backup-ready energy storage projects

The system uses approximately 4kWh-class battery modules.

Each approved Reserva Pro tower contains between three and eight modules.

Fronius Reserva Pro – Verified Technical Comparison

Usable energy figures correspond to manufacturer-defined battery-side operating conditions. AC energy delivered by the complete system also depends on inverter efficiency and operating conditions.

Fronius Reserva Pro – Main Features

• Modular high-voltage LiFePO4 storage
• Three to eight battery modules per tower
• Up to 31.9kWh usable energy per tower
• Up to four approved parallel battery towers
• Maximum manufacturer battery output current of 50A
• IP65 protection
• Modbus RS485 communication
• Compatible GEN24 Plus and Verto Plus integration
• Supported black-start functionality
• Backup operation with suitable inverter and switching equipment
• Fronius Solar.web integration
• Energy Cost Assistant compatibility
• Manufacturer-stated ten-year warranty
• Battery cells and modules manufactured in Europe

Made in Europe – Manufacturer Production Information

Fronius states that Reserva Pro battery cells and battery modules are manufactured within Europe.

The manufacturer specifically highlights this as part of its European supply and production strategy.

This manufacturing information applies to the Reserva Pro product as described by Fronius and should not automatically be extended to every component in the wider Fronius portfolio.

Buy Fronius Reserva Pro Battery Sets – Direct 3Buy Solar Product Links

Fronius Reserva Pro 12.0 – 11.9kWh

Fronius Reserva Pro 12.0 Battery Set – 11.9kWh

• Three battery modules
• 11.9kWh usable energy
• 212.52V nominal voltage
• Compatible with approved Primo GEN24 Plus, Symo GEN24 Plus and Verto Plus configurations

Fronius Reserva Pro 16.0 – 15.9kWh

Fronius Reserva Pro 16.0 Battery Set – 15.9kWh

• Four battery modules
• 15.9kWh usable energy
• 283.36V nominal voltage
• Compatible with approved Primo GEN24 Plus, Symo GEN24 Plus and Verto Plus configurations

Fronius Reserva Pro 20.0 – 19.9kWh

Fronius Reserva Pro 20.0 Battery Set – 19.9kWh

• Five battery modules
• 19.9kWh usable energy
• 354.20V nominal voltage
• Compatible with approved Primo GEN24 Plus, Symo GEN24 Plus and Verto Plus configurations

Fronius Reserva Pro 24.0 – 23.9kWh

Fronius Reserva Pro 24.0 Battery Set – 23.9kWh

• Six battery modules
• 23.9kWh usable energy
• 425.04V nominal voltage
• Compatible with approved Symo GEN24 Plus and Verto Plus configurations

Not listed as compatible with Primo GEN24 Plus.

Fronius Reserva Pro 28.0 – 27.9kWh

Fronius Reserva Pro 28.0 Battery Set – 27.9kWh

• Seven battery modules
• 27.9kWh usable energy
• 495.88V nominal voltage
• Compatible with approved Symo GEN24 Plus and Verto Plus configurations

Not listed as compatible with Primo GEN24 Plus.

Fronius Reserva Pro 32.0 – 31.9kWh

Fronius Reserva Pro 32.0 Battery Set – 31.9kWh

• Eight battery modules
• 31.9kWh usable energy
• 566.72V nominal voltage
• Compatible with approved Symo GEN24 Plus and Verto Plus configurations

Not listed as compatible with Primo GEN24 Plus.

These products are published in our Fronius catalogue. Current stock status, backorder conditions and delivery availability should be checked on the relevant product page before ordering.

Fronius Reserva Pro Battery Module & BMS – Expansion Components

Fronius Reserva Pro 3.98kWh Battery Module

Fronius Reserva Pro 3.98kWh High-Voltage Battery Module

The module is intended for use within supported Reserva Pro battery towers.

It must be integrated with the correct Reserva Pro BMS and other required system components.

Fronius Reserva Pro BMS

Fronius Reserva Pro Battery Management System

The dedicated Reserva Pro BMS performs battery monitoring, protection coordination and inverter communication within the approved platform.

Can Standard Reserva Modules Be Mixed with Reserva Pro?

No manufacturer-approved mixed-module arrangement should be assumed.

The two battery families use different module capacities, voltage configurations, system components and battery management architecture.

Professional procurement should identify whether the project requires the standard Reserva or Reserva Pro generation before selecting replacement or expansion modules.

Can Reserva Pro Be Expanded to 128kWh?

Fronius describes approved configurations of up to four 32.0 towers.

This represents approximately 128kWh of nominal battery storage.

Using the published usable-energy values:

4 × 31.9kWh = 127.6kWh usable energy.

The maximum parallel configuration depends on the compatible inverter, battery operating limits, system design and current manufacturer instructions.

Reserva Pro Battery Power

Fronius specifies a maximum battery output current of 50A.

In combination with a compatible Verto Plus, the manufacturer describes battery charging/discharging power of up to approximately 28.3kW under supported conditions.

This must not be confused with the total inverter’s AC power rating or the energy capacity of the installed battery.

Official manufacturer documents:

• Fronius Reserva Pro – Technical Datasheet (PDF)
• Fronius Reserva Pro – Installation & Operating Manual
• Fronius Reserva Pro – Product Information

Fronius Reserva vs Reserva Pro – Which Battery Is Better for Your Project?

Both systems use high-voltage LiFePO4 battery technology, but they are designed for different storage requirements.

Fronius Battery Comparison

When to Choose Standard Reserva

Reserva is relevant to installations requiring moderate energy storage capacity and compatible Fronius residential hybrid inverters.

Typical applications include residential solar self-consumption, evening electricity use and suitably sized backup circuits.

When to Choose Reserva Pro

Reserva Pro is more appropriate for projects requiring larger energy storage capacity, higher battery power and greater expansion options.

Typical applications include larger houses, agricultural buildings, workshops, small businesses and commercial hybrid systems.

Installer Recommendation

Battery selection should consider both:

Energy capacity (kWh): How much energy the system can store.

Battery power (kW): How much electricity the battery can deliver or absorb at a particular time.

A larger battery does not automatically produce a higher inverter output.

The approved inverter and battery current limits remain decisive.

Fronius Battery Compatibility – GEN24 Plus, Verto Plus & BYD

Fronius publishes a detailed compatibility matrix covering its own battery systems and selected third-party batteries.

This document is essential when specifying Fronius hybrid inverter and battery combinations.

Fronius Reserva & Reserva Pro Inverter Compatibility Matrix

This summarises Fronius’s published compatibility matrix. Product availability, applicable country certificates, current inverter firmware and additional system restrictions must also be verified.

Why Battery Capacity Changes Compatibility

As the number of battery modules increases, battery voltage and the associated electrical operating conditions change.

A larger battery is not automatically compatible with every inverter using the same brand.

Can Reserva 15.8 Be Used with Primo GEN24 Plus?

No. Fronius does not list Reserva 15.8 as compatible with either Primo GEN24 Plus or Primo GEN24 Plus SC.

For this configuration, a compatible Symo GEN24 Plus or Verto Plus platform must be considered.

Can Reserva Pro 32.0 Be Connected to Primo GEN24 Plus?

No. The manufacturer’s compatibility matrix lists Reserva Pro 32.0 for compatible Symo GEN24 Plus and Verto Plus models, not Primo GEN24 Plus.

Are Fronius Batteries Compatible with the Older Symo Hybrid?

The current compatibility matrix does not list Reserva or Reserva Pro as approved for the older Fronius Symo Hybrid platform.

Some older Fronius hybrid inverters support selected third-party battery configurations, but that does not establish compatibility with the newer Reserva families.

Fronius and BYD Battery Compatibility

Fronius also supports specified BYD Battery-Box systems, including selected:

• BYD Battery-Box Premium HVS
• BYD Battery-Box HVS+
• BYD Battery-Box Premium HVM
• BYD Battery-Box HVM+
• BYD Battery-Box HVB

Compatibility depends on exact capacity, inverter family, firmware and permitted parallel configuration.

For example, BYD HVS 5.1 and 7.7 have broader listed compatibility than some larger HVS configurations.

Fronius and LG Batteries

Fronius identifies selected LG Flex battery systems as compatible with specified GEN24 Plus configurations.

Not all LG battery models are supported by all Fronius inverter families.

Parallel Battery Compatibility

Even when both the inverter and battery support multiple towers, the approved tower quantity and total permitted charging/discharging current must be checked.

Different battery families have different parallel connection restrictions.

Official Fronius Inverter–Battery Compatibility Matrix

This manufacturer document should be consulted immediately before purchasing or commissioning the equipment.

Fronius GEN24 & GEN24 Plus – Single-Phase and Three-Phase Solar Inverters

The Fronius GEN24 and GEN24 Plus are residential photovoltaic inverter platforms designed for solar generation, energy management and supported backup applications.

The range includes:

• Fronius Primo GEN24 – Single-phase
• Fronius Primo GEN24 Plus – Single-phase hybrid
• Fronius Symo GEN24 – Three-phase
• Fronius Symo GEN24 Plus – Three-phase hybrid

Fronius GEN24 vs GEN24 Plus

The main distinction is battery functionality.

GEN24: Grid-connected photovoltaic inverter with integrated basic PV Point backup functionality and an available software upgrade path in supported markets.

GEN24 Plus: Hybrid inverter with battery connection functionality and supported additional backup options.

Fronius GEN24 Technical Overview

The precise inverter ranges, input current ratings and available model generations must be checked against the relevant manufacturer datasheet.

Fronius GEN24 SC – Superior Current Generation

Fronius has introduced the GEN24 SC (Superior Current) generation.

These variants are designed for higher photovoltaic input currents and modern solar module characteristics.

Selected SC models also integrate Fronius Arc Guard technology.

Why the SC Version Matters

Modern high-power photovoltaic panels can have significantly higher current than earlier module generations.

When evaluating a GEN24 inverter, installers must check:

• Maximum PV input current
• Maximum PV short-circuit current
• Number of MPPT trackers
• Maximum PV voltage
• Actual module current
• Supported string arrangement

An SC suffix may also affect battery compatibility, as demonstrated by Reserva 12.6.

Fronius UP.storage

Fronius offers the UP.storage software upgrade for supported GEN24 inverters.

This can activate approved battery integration and additional functions.

However, software availability and the supported upgrade path depend on the particular inverter and market.

The upgrade does not eliminate the need for the appropriate battery, smart metering and backup switching equipment.

Fronius PV Point, PV Point Comfort & Full Backup

Fronius provides several backup power options.

These are not interchangeable and should be selected according to the customer’s actual backup requirements.

Fronius PV Point – Basic Backup Without a Battery

PV Point is the manufacturer’s basic emergency power function for supported GEN24 models.

It can provide up to approximately 3kW single-phase backup power under suitable photovoltaic generation conditions.

Without a battery, the function depends on sufficient sunlight and available photovoltaic power.

It is not a complete whole-house backup system.

Fronius PV Point Comfort

PV Point Comfort is an optional accessory for compatible GEN24 systems.

It allows a designated protected circuit to remain powered during normal grid operation and switch automatically to the supported basic backup mode.

The manufacturer specifies up to 3kW continuous output under appropriate backup conditions.

The accessory does not increase the inverter’s battery compatibility or turn a GEN24 into an unrestricted backup system.

Fronius Full Backup

Full Backup is designed for appropriately configured GEN24 Plus and other supported hybrid inverter systems.

A typical Full Backup architecture requires:

• Compatible hybrid inverter
• Approved battery system
• Appropriate grid isolation
• Fronius Backup Controller or Backup Switch, where specified
• Suitable electrical distribution
• Approved metering
• Appropriate firmware and country grid settings

Important Symo GEN24 Plus Limitation

Fronius states that Full Backup is not available for the Symo GEN24 Plus 3.0, 4.0 and 5.0 models.

This restriction must be considered when specifying residential three-phase backup.

Backup Switching Time

Fronius backup systems use manufacturer-defined transfer procedures.

They should not automatically be described as uninterruptible power supplies.

For applications that cannot tolerate a transfer interruption, a dedicated UPS or another approved continuity solution may be required.

Official technical references:

• Fronius GEN24 – Product & Backup Information
• Fronius PV Point Comfort – Specifications

Fronius Verto & Verto Plus – 15kW to 33.3kW Commercial Solar Inverters

The Fronius Verto and Verto Plus are three-phase inverter platforms for larger photovoltaic installations.

Typical applications include:

• Larger residential buildings
• Commercial rooftops
• Agricultural facilities
• Workshops
• Apartment buildings
• Warehouses
• Small and medium-sized businesses

Fronius Verto – Grid-Connected String Inverter

The standard Verto is intended primarily for photovoltaic generation without the direct hybrid battery function of the Plus version.

The manufacturer lists models including:

• 15kW
• 17.5kW
• 20kW
• 25kW
• 27kW
• 30kW
• 33.3kW

Fronius Verto MPPT Configuration

The number of MPPT trackers depends on the power class.

This distinction is important for commercial rooftops with several roof orientations or different photovoltaic groups.

Fronius Verto Plus – Commercial Hybrid Inverter

Verto Plus adds the battery interface and supported hybrid functionality.

Its manufacturer portfolio includes:

• 15kW
• 17.5kW
• 20kW
• 25kW
• 30kW
• 33.3kW

The current Verto Plus family has three independent MPPT trackers.

Verto Plus Key Features

• Three-phase hybrid operation
• Three independent MPPT trackers
• 1000V maximum PV input
• 150–870V MPPT operating range
• High-voltage battery connection
• Maximum 50A battery charging/discharging current
• Compatible Reserva and Reserva Pro batteries
• Supported Full Backup
• Fronius Backup Power Boost
• Integrated arc fault protection
• DC Type 1+2 surge protection
• AC Type 2 surge protection
• Active cooling
• IP66 enclosure protection
• Solar.web monitoring

Fronius Verto vs Verto Plus

Verto Plus with Reserva Pro

The combination of Verto Plus and Reserva Pro is relevant to larger buildings requiring higher battery power.

Fronius specifies DC-coupled charging and discharging power of up to approximately 28.3kW for approved arrangements.

The actual system capability depends on inverter model, battery voltage, current limit and installed battery configuration.

Official technical reference: Fronius Verto & Verto Plus – Product Information

Fronius Tauro & Tauro ECO – Commercial and Large-Scale PV Inverters

The Fronius Tauro is a commercial photovoltaic inverter platform designed for larger solar PV installations.

It is intended for demanding operating environments and commercial energy generation.

Tauro vs Tauro ECO

The manufacturer provides different MPPT architectures.

The current manufacturer overview highlights 50kW models, while technical documentation also covers selected larger Tauro ECO configurations.

Fronius Tauro Features

• Three-phase grid-connected photovoltaic conversion
• High-voltage DC string inputs
• Active cooling
• Double-walled enclosure
• IP65 protection
• Direct and Precombined variants
• Commercial DC protection options
• Monitoring through Solar.web
• AC daisy-chain architecture
• Serviceable power-stage components

Direct vs Precombined

Tauro Direct: PV strings connect directly to the inverter’s appropriate DC input arrangement.

Tauro Precombined: Intended for systems using suitable external string aggregation and DC collection architecture.

Why Tauro Matters for EPC Projects

In commercial PV installations, inverter procurement affects more than the inverter purchase price.

Installers must also consider:

• DC cable routes
• Combiner boxes
• AC collection
• Installation labour
• Maintenance access
• Monitoring
• Inverter placement
• Grid requirements
• Long-term service costs

Tauro is designed for professional installations requiring these considerations.

Important: Tauro is a grid-connected commercial string inverter. It should not be treated as a direct replacement for Verto Plus when battery integration is required.

Fronius Argeno 125 – High-Efficiency Commercial Solar Inverter

The Fronius Argeno 125 is a larger commercial photovoltaic inverter using advanced power electronics technology.

The manufacturer describes the platform as incorporating silicon carbide semiconductor technology.

Argeno 125 Technical Specifications

Why Ten MPPTs Matter

Larger commercial rooftops may have:

• Multiple roof surfaces
• Different module orientations
• Several PV string groups
• Different shading conditions
• Large installed DC capacity

Ten independent MPPT trackers provide additional flexibility when designing suitable electrical string groups.

The final architecture must still respect the manufacturer’s input current, voltage and string configuration limits.

Is Argeno a Hybrid Battery Inverter?

No.

Argeno is intended for grid-connected photovoltaic conversion.

A project requiring battery energy storage must incorporate an approved additional energy storage architecture.

Argeno for Commercial PV

Typical projects include:

• Industrial rooftops
• Large warehouses
• Commercial production facilities
• Ground-mounted photovoltaic systems
• Large commercial self-consumption installations

Official manufacturer reference: Fronius Argeno 125 – Technical Specifications & Grid Certificates

Argeno availability through 3Buy Solar requires project-based confirmation.

Fronius Wattpilot Flex & Wattpilot Go – Solar EV Charging

The Fronius Wattpilot range provides intelligent electric vehicle charging equipment designed for integration with suitable solar PV and energy management systems.

Current product families include:

• Wattpilot Flex Home
• Wattpilot Flex Pro
• Wattpilot Go

Wattpilot Flex Home

A fixed installation EV charger for residential applications.

The platform is available in power configurations including 11kW and 22kW, depending on product version and market availability.

Wattpilot Flex Pro

Designed for installations requiring additional user and charging management features.

Its commercial suitability and metering functionality depend on the exact model.

Wattpilot Go

A mobile charging solution for suitable electrical supply connections.

The manufacturer offers 11kW and 22kW versions.

Wattpilot Solar Surplus Charging

One important feature is intelligent charging from available solar PV generation.

On supported configurations, Wattpilot can adjust charging current and switch between single-phase and three-phase operation.

The manufacturer specifies a solar surplus charging range beginning at approximately 1.38kW.

What Must Installers Verify?

• Available grid connection capacity
• Charging power
• Single-phase or three-phase electrical supply
• Required protective devices
• Smart Meter integration
• Solar surplus control
• Dynamic load management
• Supported vehicle and charging mode
• Country-specific regulations
• Internet and network connectivity

Official manufacturer references:

• Fronius Wattpilot Flex – Product Information
• Fronius Wattpilot – Installer Support

Browse related EV Chargers at 3Buy Solar.

Fronius Ohmpilot – Smart Solar Surplus Water Heating

The Fronius Ohmpilot is designed to control suitable resistive electrical heating loads using available photovoltaic electricity.

It is relevant to installations with electric water heaters and compatible heating elements.

Fronius Ohmpilot Technical Specifications

How Does Ohmpilot Work?

When the photovoltaic system produces surplus electricity, Ohmpilot can increase the power supplied to a suitable heating element.

This allows available solar energy to be used for domestic hot water production.

The power is continuously controlled according to the permitted load and system conditions.

Important: Ohmpilot Is Not a Universal Heat Pump Controller

Fronius specifies the use of purely resistive electrical loads.

Heating elements with unsuitable electronic control components or other incompatible equipment must not be connected directly as though they were conventional resistive loads.

For professional installers, this distinction matters when integrating:

• Electric water heaters
• Domestic hot water cylinders
• Thermal storage
• Solar surplus heating

The manufacturer’s electrical requirements and the heating equipment’s specifications must be checked.

Official reference: Fronius Ohmpilot – Technical Specifications

Fronius Smart Meter – Energy Measurement for Hybrid PV Systems

The Fronius Smart Meter is a bidirectional electricity measurement device for suitable Fronius photovoltaic and storage systems.

It provides information about energy imported from and exported to the public electricity network.

These measurements support coordinated inverter and battery operation.

Common Fronius Smart Meter Models

Smart Meter TS 65A-3

A direct-connected three-phase meter for supported residential and smaller commercial applications.

Smart Meter TS 100A-1

A single-phase meter for suitable current and voltage requirements.

Smart Meter IP 5kA-3

A meter intended for larger installations using compatible external current transformers.

Important CT Requirement

Fronius specifies that the Smart Meter IP 5kA-3 uses current transformers with a 333mV secondary voltage output.

This is not interchangeable with every conventional current transformer configuration.

Installers must use compatible CT equipment and correct metering settings.

Why Smart Meter Selection Matters

Accurate measurement is important for:

• Solar self-consumption optimisation
• Battery charging
• Battery discharging
• Grid import monitoring
• Export limitation
• Wattpilot solar charging
• Ohmpilot surplus control
• Energy Cost Assistant functionality

The correct meter must be specified for the network and selected Fronius control architecture.

Official reference: Fronius Smart Meter – Product Range & Compatibility

Fronius Solar.web – Photovoltaic Monitoring & Energy Management

Fronius Solar.web is the manufacturer’s monitoring and energy management platform.

It provides information about compatible photovoltaic systems, battery storage and energy flows.

Depending on the installed equipment, available data includes:

• Photovoltaic production
• Inverter operating status
• Grid electricity import
• Grid electricity export
• Household or site consumption
• Battery state of charge
• Battery charging and discharging
• Historical production
• Equipment alerts
• Energy management information

Fronius Solar.web for Professional Installers

Remote monitoring can help installers identify operating issues without immediately scheduling a site visit.

It may also support customer reporting and long-term PV maintenance.

However, remote monitoring does not replace on-site electrical safety testing or physical fault diagnosis when required.

Fronius Energy Cost Assistant – AI-Based Battery Optimisation

The Fronius Energy Cost Assistant is an AI-assisted energy management feature.

It is designed to use forecasts and relevant electricity price information to optimise compatible battery storage systems.

Energy Cost Assistant Functions

Depending on country and operating configuration, the system can:

• Forecast photovoltaic generation
• Estimate electricity consumption
• Incorporate electricity prices
• Schedule battery charging
• Adjust battery discharging
• Support dynamic tariff optimisation
• Coordinate energy storage with export limitations

Does Energy Cost Assistant Require Additional Hardware?

Fronius describes the feature as software-based for suitable existing systems.

However, the installation must already include the supported inverter, battery and required measurement architecture.

Software & Subscription Requirements

The manufacturer specifies requirements including:

• Compatible GEN24 Plus or Verto Plus inverter
• Approved battery storage
• Fronius Solar.web Premium
• Suitable inverter firmware
• Supported country and tariff arrangement
• Required weather and forecast information

Does AI Energy Management Guarantee Savings?

No.

The financial benefit depends on local electricity pricing, consumption patterns, battery usage, efficiency losses and operating strategy.

For professional installations, savings should be assessed using actual electricity tariffs and expected system performance.

Official reference: Fronius Energy Cost Assistant – Features & Requirements

Fronius Complete Solar Kits – Inverter, Reserva Battery & Backup Equipment

A complete Fronius solar-plus-storage system requires more than a hybrid inverter and battery modules.

The required equipment depends on the system architecture and intended operating functions.

Typical Fronius Residential Hybrid Kit

A project may include:

• Fronius GEN24 Plus inverter
• Compatible Reserva or Reserva Pro battery
• Required battery BMS
• Battery base and connection equipment
• Solar photovoltaic modules
• Fronius Smart Meter
• AC and DC protection
• PV cables and connectors
• Mounting system
• Monitoring configuration
• Backup Controller or Backup Switch where required

Example – 10kW Three-Phase Hybrid Solar System

A conceptual system may include:

• Symo GEN24 Plus 10kW
• Reserva 12.6 battery system
• Four Reserva modules
• Required BMS
• Solar PV array
• Smart Meter
• Appropriate electrical protection

The actual equipment must be selected according to the exact inverter hardware, battery approval and national grid requirements.

This is a design illustration, not a complete approved bill of materials.

Example – Larger Commercial Fronius Storage

A suitable commercial system may include:

• Verto Plus hybrid inverter
• Reserva Pro battery system
• Smart Meter or appropriate measurement arrangement
• Commercial photovoltaic array
• Required backup equipment
• Correct battery and inverter communication
• AC and DC distribution equipment
• Monitoring and commissioning

Why Complete Kit Compatibility Matters

The purchasing team must verify:

• Correct inverter model
• Battery capacity
• Battery current rating
• Battery operating voltage
• BMS requirements
• Meter compatibility
• Backup architecture
• Accessories included in the battery set
• Required firmware
• Grid certification

A battery module should not be treated as a complete battery set, and a battery set should not be treated as a complete photovoltaic installation.

Browse related Energy Storage Kits with Inverter and Complete Solar PV Kits.

Fronius Installer Compatibility & Procurement Checklist

Before ordering a Fronius system, professional installers should confirm the following.

Inverter

• Exact Fronius model
• GEN24 or GEN24 Plus designation
• Standard or SC generation
• Single-phase or three-phase
• Rated AC output
• Number of MPPT trackers
• Maximum photovoltaic input current
• Maximum battery current
• Current firmware

Battery

• Reserva or Reserva Pro
• Exact battery capacity
• Number of modules
• Required BMS
• Battery voltage range
• Compatible inverter
• Approved parallel arrangement
• Maximum permitted discharge power
• Expansion requirements

Photovoltaic Array

• Solar panel manufacturer
• Module wattage
• Open-circuit voltage
• Maximum power voltage
• Short-circuit current
• String configuration
• Number of strings per MPPT
• Temperature-adjusted voltage

Backup

• PV Point only
• PV Point Comfort
• Full Backup
• Backup Controller
• Backup Switch
• Essential loads
• Three-phase loads
• Battery discharge capability
• Local electrical protection

Energy Management

• Smart Meter model
• CT requirements
• Solar.web integration
• Wattpilot integration
• Ohmpilot requirements
• Dynamic tariff support
• Energy Cost Assistant eligibility

Documentation

• Inverter datasheet
• Battery datasheet
• Battery compatibility matrix
• Installation manual
• EU Declaration of Conformity
• Grid connection certificate
• Manufacturer warranty
• Required national approvals

This checklist is particularly useful for professional RFQs, EPC equipment schedules and complete solar battery kit procurement.

Fronius CE Certificates, Grid Compliance & Technical Documentation

Fronius provides manufacturer documentation covering inverter installation, battery storage, product safety and European grid requirements.

For professional solar PV procurement, the exact documents must correspond to the model and country of installation.

Official Fronius Technical Resources

Fronius Solar & Energy – Official Manufacturer Website

Product information and current Fronius solar technology.

Fronius – Technical Help Center

Installation instructions, troubleshooting and technical resources.

Fronius – GEN24 & GEN24 Plus Support

Commissioning, backup and battery integration information.

Fronius – Official Battery Compatibility Matrix

Supported Reserva, Reserva Pro, BYD and LG battery combinations.

Fronius Reserva Pro – Operating Manual

Battery installation, operating limits and safety documentation.

Fronius Verto & Verto Plus – Technical Information

Commercial grid-tied and hybrid inverter specifications.

Fronius Argeno – Certifications & Datasheets

Technical files for the larger commercial inverter range.

European Technical Compliance

Depending on the product and country, relevant documents may include:

• EU Declaration of Conformity
• CE-related compliance documentation
• Inverter electrical safety certificates
• EMC compliance
• Grid connection certificates
• National implementation of EN 50549
• Battery safety certificates
• IEC 62619 battery documentation
• Battery transport documentation under UN 38.3
• Applicable battery installation standards
• Firmware and grid-code settings
• Manufacturer warranty documentation

An inverter certified for one European grid connection arrangement is not automatically approved for every other country.

Fronius Warranty

Fronius warranty conditions differ between inverters, batteries and accessories.

The Reserva and Reserva Pro ranges have manufacturer-stated ten-year warranty coverage under their applicable terms.

Battery warranty conditions may include retained capacity, operating conditions and warranty registration requirements.

Always verify the exact warranty policy before issuing a binding commercial or installation proposal.

Fronius Installer Training – 3Buy Solar Reserva Installation Video

Professional Fronius installation requires correct battery module assembly, inverter compatibility, electrical connection, backup design and commissioning.

The 3Buy Solar YouTube Training & Technical Support Channel provides technical demonstrations and installation resources for solar PV, hybrid inverters and battery energy storage.

Watch: Fronius Reserva Battery Installation – 3Buy Solar

Fronius Reserva Home Energy Storage Battery – Professional Installation Video

This video, published on the 3Buy Solar YouTube channel, covers the professional installation workflow of the Fronius Reserva battery platform.

Topics include:

• Pre-installation planning
• Battery module handling
• System positioning and mounting
• Battery stack assembly
• Electrical connection
• Hybrid inverter integration
• Commissioning
• Monitoring
• Backup considerations
• Expansion planning

This is a relevant training resource for professional installers preparing a Fronius Reserva project.

It covers the standard Reserva family. Reserva Pro installers must follow the separate manufacturer documentation for that system.

Fronius Solar.start – Official Commissioning App

Fronius Solar.start – Installer Commissioning

Fronius Solar.start guides compatible equipment commissioning and system configuration.

Fronius Solar.SOS – Installer Technical Support

Fronius Solar.SOS – Online Service & Troubleshooting

The manufacturer’s service platform supports diagnostics, technical questions and eligible service cases.

Fronius Solar.creator – Design & Planning

Fronius Solar.creator – PV System Design Tool

A free manufacturer planning tool for supported solar PV designs and component configuration.

3Buy Solar Installer Academy

For additional technical education, visit the 3Buy Solar Installer Training & Webinar Academy.

Installation videos supplement the current manufacturer manuals and do not replace required electrical safety procedures.

Why Professional Solar Installers Choose Fronius

Fronius provides an integrated European solar energy ecosystem that includes photovoltaic generation, battery storage, backup power, monitoring, EV charging and intelligent load management.

European Engineering

Fronius develops photovoltaic power conversion technology with an established European engineering and service infrastructure.

Modular Solar Battery Storage

Reserva and Reserva Pro provide different battery capacities and expansion options for residential and commercial systems.

Hybrid Inverter Technology

GEN24 Plus and Verto Plus offer approved DC-coupled energy storage solutions.

Flexible Commercial Solar Inverters

Verto, Tauro and Argeno provide different architectures for commercial photovoltaic installations.

Integrated Energy Monitoring

Solar.web, Smart Meter and additional control tools support PV system visibility.

Smart Energy Management

Energy Cost Assistant provides supported AI-based battery optimisation.

Solar EV Charging

Wattpilot offers solar-aware charging and compatible load management functions.

Solar Water Heating

Ohmpilot provides a way to use photovoltaic surplus electricity for suitable resistive heating loads.

Technical Support & Documentation

Fronius provides design tools, installer commissioning applications, compatibility information and official service resources.

For professional buyers, the appropriate product should be selected according to the project’s electrical requirements, battery compatibility, installation cost, approved functions and commercial objectives.

Why Buy Fronius Reserva Batteries from 3Buy Solar?

3Buy Solar is a European B2B solar PV supplier, solar wholesaler and energy storage distributor serving professional installers, EPC contractors, resellers and technical procurement teams.

Our Fronius offering includes individual Reserva and Reserva Pro battery components together with complete modular battery configurations.

Fronius Reserva Battery Procurement

Professional buyers can access the listed standard Reserva systems from 6.3kWh to 15.8kWh.

Reserva Pro for Larger Projects

The published catalogue includes Reserva Pro systems from 11.9kWh to 31.9kWh.

Battery Modules & BMS

Individual modules and their corresponding battery management equipment are listed separately for approved system requirements.

European B2B Purchasing

Our webshop provides model-specific product pages, purchasing information and available order options.

Project-Based Quotations

For larger projects, buyers can submit the required battery capacity, inverter model, quantity and destination.

Multibrand System Procurement

Our broader product catalogue includes solar panels, inverters, electrical protection, monitoring accessories and complete kit components.

Manufacturer Documentation

We provide links to official technical resources and encourage compatibility checks before purchase.

Installer Training

Our own Fronius Reserva installation video and technical training resources support professional installers.

3Buy Solar Collection Service – Hungary

Eligible confirmed orders may be collected through the 3Buy Solar Collection Service.

Collection location: DEPO, Raktárvárosi út 1, 2045 Törökbálint, Hungary.

Collection hours: Monday–Friday, 08:00–14:00.

The service supports eligible palletised and parcel orders, with no maximum pallet quantity per order.

Collection is subject to advance order and readiness confirmation.

Request a Fronius B2B Quotation

For Fronius GEN24 Plus, Verto Plus, Reserva Pro, Wattpilot, commercial inverter procurement or a complete installation package, contact our team with the relevant manufacturer specifications.

Contact 3Buy Solar – Fronius B2B Equipment & Project Enquiry

Frequently Asked Questions About Fronius Inverters & Batteries

Who manufactures Fronius solar inverters?

Fronius is an Austrian technology company manufacturing solar inverters, hybrid energy systems, battery storage, EV charging and energy management equipment.

Which Fronius products are listed at 3Buy Solar?

The Fronius brand catalogue includes standard Reserva and Reserva Pro battery sets, individual battery modules and corresponding BMS equipment. Other Fronius product families can be requested through project-based procurement enquiries.

What is Fronius Reserva?

Reserva is a modular high-voltage LiFePO4 battery system designed for approved Fronius hybrid inverters. It provides usable capacities from 6.31kWh to 15.79kWh per tower.

What is Fronius Reserva Pro?

Reserva Pro is a higher-capacity battery family for large residential and commercial energy storage applications. It provides 11.9–31.9kWh usable energy per tower.

What is the difference between Reserva and Reserva Pro?

Reserva uses 3.15kWh-class modules and permits two to five modules per tower. Reserva Pro uses approximately 4kWh-class modules and permits three to eight modules per tower. They have different battery management and electrical architectures.

Can Reserva and Reserva Pro modules be mixed?

The two battery families should not be combined into an unapproved mixed stack. Use the manufacturer-defined battery modules and BMS for the selected platform.

What is the minimum standard Reserva battery capacity?

The minimum complete standard Reserva configuration contains two modules and provides 6.31kWh usable energy.

What is the minimum Reserva Pro capacity?

The smallest approved Reserva Pro configuration uses three modules and provides 11.9kWh usable energy.

Can Fronius Reserva be expanded?

Yes, within the manufacturer’s approved expansion arrangements. Standard Reserva towers support two to five modules, and supported parallel configurations permit up to four towers.

How much storage can four Reserva towers provide?

Four Reserva 15.8 towers provide approximately 63.16kWh usable energy. The permitted charging/discharging current remains limited by the manufacturer-approved system architecture.

Can Fronius Reserva Pro provide 128kWh?

Fronius describes a maximum four-tower Reserva Pro arrangement of approximately 128kWh nominal storage. Four 31.9kWh usable-energy towers provide approximately 127.6kWh usable capacity.

Can I connect Reserva 12.6 to Primo GEN24 Plus?

The manufacturer’s compatibility matrix does not approve Reserva 12.6 for the standard Primo GEN24 Plus. It lists compatibility with Primo GEN24 Plus SC and other approved hybrid inverter families.

Can I connect Reserva 15.8 to Primo GEN24 Plus?

No. Fronius lists Reserva 15.8 for approved Symo GEN24 Plus and Verto Plus systems, not Primo GEN24 Plus.

Can Reserva Pro 24.0, 28.0 or 32.0 work with Primo GEN24 Plus?

No. These configurations are not listed as compatible with either Primo GEN24 Plus variant.

Which Fronius inverters work with Reserva Pro 32.0?

The manufacturer lists compatible Symo GEN24 Plus and Verto Plus models, subject to firmware, certification and installation requirements.

Is Fronius Reserva compatible with the older Symo Hybrid?

The current Fronius compatibility matrix does not list standard Reserva or Reserva Pro as compatible with the older Symo Hybrid inverter.

Can Fronius hybrid inverters use BYD batteries?

Yes, selected Fronius hybrid inverter models are compatible with approved BYD Battery-Box HVS, HVS+, HVM, HVM+ and HVB systems. The exact capacity and inverter combination must appear in the manufacturer compatibility list.

Are Fronius inverters compatible with LG batteries?

Selected GEN24 Plus models are compatible with specified LG Flex batteries. The exact combination must be checked in Fronius’s current documentation.

What is the difference between GEN24 and GEN24 Plus?

GEN24 provides photovoltaic conversion and supported basic backup functionality. GEN24 Plus adds the approved battery interface and additional hybrid functions.

Can GEN24 be upgraded to GEN24 Plus?

Supported GEN24 models can receive the Fronius UP.storage software upgrade in eligible markets. The actual upgrade and additional battery or backup equipment requirements must be confirmed for the inverter.

What is Fronius GEN24 SC?

GEN24 SC is the Superior Current generation designed for modern solar modules with higher PV input currents. Selected models also provide integrated arc fault protection.

Does Fronius GEN24 provide backup power without batteries?

Supported GEN24 systems offer PV Point basic backup, which can supply a suitable single-phase circuit when sufficient photovoltaic electricity is available.

Does Fronius PV Point supply the whole house?

No. PV Point is intended for a limited backup circuit and has a specified maximum power of approximately 3kW.

Can Symo GEN24 Plus 5kW provide Full Backup?

No. Fronius states that Full Backup is unavailable for Symo GEN24 Plus 3.0–5.0.

What is the difference between Fronius Verto and Verto Plus?

Verto is a grid-connected commercial solar inverter. Verto Plus is the corresponding hybrid platform with approved battery connection and supported backup capabilities.

How many MPPT trackers does Fronius Verto have?

The 15–25kW Verto models have three MPPT trackers, while the 27–33.3kW models have four. Verto Plus models in the current manufacturer range have three.

Can Verto Plus use Reserva Pro batteries?

Yes. Approved Verto Plus systems support Reserva Pro configurations, subject to the manufacturer’s battery compatibility and current limits.

What is Fronius Tauro?

Tauro is a commercial string inverter platform for larger PV systems. The manufacturer offers Direct and Precombined versions with defined MPPT and protection configurations.

What is Fronius Argeno 125?

Argeno 125 is a 125kVA-class commercial photovoltaic inverter with ten MPPT trackers and manufacturer-stated peak efficiency of 99.1%.

Does Fronius manufacture EV chargers?

Yes. The Wattpilot family includes Flex Home, Flex Pro and Go products with smart solar charging functions on supported installations.

Can Wattpilot charge an EV using only solar surplus?

Supported Wattpilot installations can adjust charging according to available PV surplus, subject to the required metering, electrical supply and charger configuration.

What is Fronius Ohmpilot?

Ohmpilot is an energy management device for regulating appropriate resistive heating elements using photovoltaic surplus electricity, with power classes up to 3kW single-phase and 9kW three-phase.

Can Ohmpilot directly control any heat pump?

No. Ohmpilot is specified for suitable resistive electrical loads. Heat pumps and electronically controlled heating equipment must only be integrated through approved interfaces and control arrangements.

What is Fronius Solar.web?

Solar.web is Fronius’s monitoring and energy management platform for compatible photovoltaic and battery systems.

What is Fronius Energy Cost Assistant?

The Energy Cost Assistant is an AI-assisted battery management feature that uses forecasts and electricity price information to optimise supported energy storage systems.

Does Energy Cost Assistant work throughout Europe?

Availability depends on the country, supported tariff arrangements, inverter, battery, firmware and Solar.web Premium requirements.

Are Fronius Reserva batteries LiFePO4?

Yes. Both standard Reserva and Reserva Pro use lithium iron phosphate battery chemistry.

What warranty does Fronius provide on Reserva batteries?

Fronius states a ten-year warranty for its Reserva and Reserva Pro systems, subject to the applicable product terms and operating conditions.

Where can I download Fronius CE certificates and technical documents?

Fronius provides official documentation through its Solar & Energy Help Center and the product-specific technical information pages.

Where can professional installers buy Fronius batteries in Europe?

Professional solar installers, EPC contractors, resellers and approved B2B buyers can order or enquire about Fronius Reserva and Reserva Pro products through 3Buy Solar. Availability, prices and delivery conditions are displayed or confirmed during procurement.

Buy Fronius Reserva, Reserva Pro & Hybrid Energy Storage from 3Buy Solar

Fronius provides an integrated photovoltaic and energy storage portfolio for residential, commercial and industrial applications.

From GEN24 and GEN24 Plus residential inverters to Verto Plus hybrid systems, modular Reserva battery storage, Wattpilot EV charging, Ohmpilot water heating and Solar.web energy management, the manufacturer offers technology for professionally designed solar installations.

At 3Buy Solar, we help European installers, EPC contractors, resellers and procurement teams identify the correct Fronius products, compare official technical specifications and source the components required for complete solar PV and energy storage projects.

Browse the Reserva and Reserva Pro battery systems listed on this brand page and verify inverter compatibility before ordering.

For volume purchases, new Fronius hybrid inverter systems, battery expansion, commercial energy storage or complete project procurement, contact the 3Buy Solar B2B sales team.

3Buy Solar – European B2B Supply for Fronius Reserva Batteries, GEN24 Hybrid Inverters, Verto Plus & Solar Energy Storage.