Is the Fronius Reserva Pro 3.98 kWh HV unit a complete battery system?

No. The Fronius Reserva Pro 3.98 kWh product is a single high-voltage battery module and not a complete energy storage system. It requires the dedicated Fronius Reserva Pro Battery Management Unit (BMS) and the appropriate system components for operation.

Is a separate BMS required for the Fronius Reserva Pro 3.98 kWh battery module?

Yes. The Fronius Reserva Pro 3.98 kWh HV battery module must be installed together with the official Fronius Reserva Pro Battery Management Unit (BMS). The BMS controls cell balancing, voltage monitoring, temperature protection and communication with the compatible Fronius hybrid inverter.

Which inverters are compatible with the Fronius Reserva Pro battery system?

The Fronius Reserva Pro high-voltage battery system is designed for integration with compatible Fronius hybrid inverter platforms, including approved Fronius GEN24 Plus models. Compatibility depends on inverter type, firmware version and system configuration. Installers should verify the latest official Fronius documentation before commissioning.

Can the Fronius Reserva Pro 3.98 kWh battery module be expanded?

Yes. The 3.98 kWh HV module is part of a modular and stackable energy storage system. Multiple battery modules can be combined within a Fronius Reserva Pro system to increase total storage capacity, subject to the technical limits defined in the official system documentation.

Does the Fronius Reserva Pro battery system support backup power?

Backup functionality depends on the paired Fronius hybrid inverter and the installed backup configuration. When combined with compatible Fronius GEN24 Plus inverter systems and correctly configured, the Reserva Pro battery system can support selected loads during grid outages, in accordance with local regulations and system design.

What certifications apply to the Fronius Reserva Pro battery modules?

Fronius high-voltage battery modules comply with applicable European safety and transport standards. Depending on the market version, this may include CE conformity, IEC 62619, UN 38.3 and other relevant certifications. Installers should confirm the exact compliance documentation supplied with the delivered components.

Fronius Reserva Pro 3.98 kWh battery module for high-voltage solar battery energy storage system, modular expansion unit for hybrid PV installations supplied by European solar wholesaler.

Fronius Reserva Pro 3.98 kWh HV Battery Module for High-Voltage Energy Storage Systems

The Fronius Reserva Pro 3.98 kWh HV Battery Module is a high-voltage lithium iron phosphate (LiFePO₄) solar battery designed for scalable residential and commercial energy storage systems. Engineered for seamless integration with Fronius hybrid inverters, this modular battery module enables flexible system expansion, high efficiency, and long service life. Ideal for installers, EPCs, and professional solar PV suppliers seeking reliable energy storage with maximum safety and performance.

Battery module only – BMS/control unit required for operation.

3.98 kWh usable capacity per module
High-voltage architecture for hybrid inverter systems
Modular and stackable design
Compatible with Fronius GEN24 Plus series
Long cycle life LiFePO₄ chemistry
Suitable for residential and light commercial solar battery storage

SKU: FRONIUS-RESERVA-3.98-BAT-MOD

1389.88 €

Available on backorder

EU Warehouse i

3Buy Partner stock.

Estimated delivery: 5–12 working days

Shipping type: Pallet freight

Available on backorder

Weight	36 kg
Dimensions	160 × 579 × 449 mm
Product Category	Batteries, Battery Sets
Brand	Fronius
Battery Type	High VoltageEfficient large-scale battery technology operating above 400 V DC., Lithium Iron Phosphate (LiFePO4) – LFPLithium Iron Phosphate (LiFePO4) batteries are one of the most reliable and safest energy storage solutions for solar systems. Known for their long lifespan, high efficiency, and superior safety, these batteries are a top choice for residential, commercial, and off-grid solar storage.
Rated Power [W]Indicates the maximum continuous power output or input the device can handle under standard operating conditions, measured in watts (W).	4kW
Nominal Capacity [kWh]Nominal capacity (in kWh) typically refers to the rated energy storage or output capacity of a system, such as a battery, energy storage system, or electric vehicle battery. It indicates the amount of energy that the system can store or deliver under normal operating conditions.	3.98 kWh
Nominal Voltage [V]The nominal voltage is defined as the voltage value assigned to an electric circuit or system to designate its voltage class. In simple words, the voltage level of an electrical power system is called the nominal voltage of the system.	70.84V
Max. Charge & Discharge Current [A]The maximum charge and discharge current refers to the highest current a battery or energy storage system can handle safely during charging and discharging processes. It is an important parameter that helps ensure the battery operates within safe limits and prevents damage, overheating, or other safety hazards.	50 A
CommunicationSpecifies how the device communicates with other systems or networks—options include RS485, CAN, LAN, Wi-Fi, 4G, and Optical for data exchange and remote monitoring.	RS485
Protection Rating [IP]IP (or \"Ingress Protection\") ratings are defined in international standard EN 60529 (British BS EN 60529:1992, European IEC 60509:1989). They are used to define levels of sealing effectiveness of electrical enclosures against intrusion from foreign bodies (tools, dirt etc) and moisture.	IP65An IP65 rated enclosure gives protection against low pressure water jets from any direction, as well as condensation and water spray. It's suitable for most outdoor enclosures that won't encounter extreme weather such as flooding.
WarrantyNormally covers, manufacturing defects, durability issues, or equipment failure. The warranty typically covers the cost of replacing the faulty or damaged panel with a new working one. Please refer to the Warranty Documents of the product on the Manufacturer s webpage.	10 Years

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Fronius Reserva Pro 3.98 kWh HV Battery Module for High-Voltage Energy Storage Systems

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Product description

Fronius Reserva Pro 3.98 kWh HV Battery Module – High-Voltage Solar Battery Storage

Key Technical Specifications

Designed for Fronius Hybrid Inverter Systems

Scalable Energy Storage for Modern Solar PV Systems

Advanced LiFePO₄ Safety and Long Service Life

Applications

Why Choose Fronius Reserva Pro from a Professional Solar Wholesaler?

Product Datasheet and Downloads

Fronius Hybrid Wechselrichter Batterie Kompatibilitätsliste DE

CE Declaration of Conformity

Manufacturer Warranty Fronius Reserva Pro ESS

FAQ: Fronius Reserva Pro 3.98 kWh Module

Yes — you DO need the Fronius Reserva Pro BMS / Battery Management Unit

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Fronius Reserva Pro 3.98 kWh HV Battery Module for High-Voltage Energy Storage Systems