What is AFCI in the SolaX X3-ULT-25K hybrid inverter?

AFCI (Arc Fault Circuit Interrupter) is a built-in safety feature that detects dangerous DC arc faults and automatically shuts down the system to reduce fire risk in solar PV installations.

What is the difference between the SolaX X3-ULT-25K and the AFCI version?

The AFCI version includes integrated arc fault detection and automatic shutdown, making it more suitable for commercial installations requiring enhanced safety and compliance.

Is the SolaX X3-ULT-25K AFCI compatible with solar battery systems?

Yes. The inverter supports high-voltage solar battery systems and is designed for hybrid energy storage applications including self-consumption and backup power.

Where should the SolaX X3-ULT-25K AFCI be used?

This inverter is ideal for commercial, industrial, and agricultural solar PV systems where fire safety, compliance, and energy storage integration are critical.

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SolaX X3-ULT-25K hybrid solar inverter 25kW 3-phase AFCI energy storage system for commercial solar installations Europe

SolaX X3-ULT-25K AFCI Hybrid Solar Inverter – 25kW 3-Phase Energy Storage Solution

The SolaX X3-ULT-25K AFCI is a 25kW three-phase hybrid solar inverter with integrated Arc Fault Circuit Interrupter (AFCI), engineered for safe and efficient commercial solar PV and energy storage systems. Designed for installers, EPCs, and solar distributors, it combines high PV input capacity, intelligent hybrid control, and advanced fire protection.

SKU: SOLAX-X3-ULT-25K-AFCI

2432.88 € (net, excl. VAT)

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Product description

Three-Phase C&I Hybrid Solar Inverter for Solar Battery, Energy Storage, and Complete Kits

SolaX X3-ULT-25K AFCI – 25kW Hybrid Solar Inverter with Integrated Arc Fault Protection for Commercial PV Systems

High-Performance 25kW Hybrid Inverter with 50kWp PV Input and UPS-Level Backup

SolaX X3-ULTRA 3-phase hybrid solar inverter for energy storage systems, compatible with solar battery solutions and complete kits for commercial and residential PV installations

The SolaX X3-ULT-25K AFCI hybrid solar inverter is designed for commercial and industrial solar PV systems where safety, performance, and system reliability are critical. With a rated output of 25kW and integrated AFCI (Arc Fault Circuit Interrupter), this inverter actively detects arc faults and disconnects the system to prevent electrical fire risks.

Part of the SolaX X3-ULTRA platform, this model combines high PV input flexibility, advanced hybrid functionality, and real-time safety monitoring, making it ideal for solar PV suppliers, EPCs, and solar wholesalers delivering professional energy storage systems.

The X3-ULTRA series is available in multiple power classes including 15kW, 20kW, 25kW and 30kW, supporting scalable commercial installations.

Electrical Performance & PV Input Architecture

The SolaX X3-ULT-25K AFCI is optimized for high-yield solar PV system design:

Rated AC output: 25,000 VA (3-phase)
Recommended PV input power: up to 50,000–60,000 Wp
3 independent MPPT trackers
2 strings per MPPT
Max input current: 36 A per MPPT
PV voltage range: 120 – 950 V
Supports up to 200% PV oversizing

This configuration allows installers to deploy high-power solar panels and optimize yield across complex commercial rooftops and distributed PV systems.

Hybrid Energy Storage & Solar Battery Integration

The inverter is engineered for modern energy storage systems:

Battery voltage range: 120 – 800 V
Max charge/discharge current: up to 60 A
Compatible with high-voltage lithium solar battery systems
Supports hybrid operation, self-consumption, and peak shaving

It integrates seamlessly into complete solar kits, combining solar panels, solar inverter, and solar battery for full energy management.

AFCI Safety System – Arc Fault Detection & Fire Prevention

The SolaX X3-ULT-25K AFCI includes integrated arc fault protection:

Continuous monitoring of DC arc faults
Automatic shutdown in case of abnormal current detection
Reduced fire risk in PV systems
Enhanced compliance with modern safety standards

This makes the AFCI version particularly suitable for:

Commercial buildings
Industrial rooftops
Agricultural installations
High-power solar PV systems

Compared to standard hybrid inverters, the AFCI model provides an additional safety layer required in many regulated markets.

Smart Hybrid Control & Energy Management

The X3-ULT-25K AFCI includes advanced system intelligence:

Self-consumption optimization
Time-of-use energy scheduling
Peak shaving for commercial tariffs
Smart load control (EV chargers, heat pumps)
Built-in shadow tracking
Generator and microgrid compatibility
Parallel operation of up to 10 units

This allows scalable hybrid PV systems and intelligent energy storage deployments.

Backup Power & EPS Capability

EPS (Emergency Power Supply) functionality
Switchover time below 10 ms
Peak backup output capability

This ensures continuous operation during grid outages and supports critical load applications.

Mechanical Design & Installation

IP66-rated enclosure (indoor & outdoor installation)
Integrated Type II surge protection (AC/DC)
AFCI integrated into system architecture
Dimensions: 696 × 526 × 240 mm
Weight: approx. 46–47 kg

The system is built for long-term operation in European climates and fast installer deployment.

Applications & Use Cases

The SolaX X3-ULT-25K AFCI hybrid inverter is ideal for:

Commercial and industrial solar PV systems
Agricultural and rural energy storage
Large residential installations
Peak shaving and time-of-use optimization
Complete solar energy storage kits
Solar wholesaler and EPC system packages

Why Choose SolaX X3-ULT-25K AFCI

25kW high-performance hybrid solar inverter
Integrated AFCI arc fault protection
Designed for solar battery and energy storage systems
Scalable architecture for commercial projects
Ideal for solar PV suppliers, solar distributors, and solar wholesalers

Compliance & Product Family Downloads

The X3-ULTRA family is published by SolaX with official product page and under this product just bellow, downloads including Datasheet, User Manual, Quick Installation Guide, Certificates and Declarations. For project design, procurement, and commissioning, installers should always verify the latest official compatibility lists, local grid-code requirements, and current firmware support before installation.

Product Datasheet and Downloads

Datasheet

Installation and Operation Manual

Certificates

Declaration of Conformity SolaX X3-ULTRA

Warranty

Manufacturer Warranty SolaX X3-ULTRA

FAQ: SolaX X3H-ULT-25K 25kW Hybrid Solar Inverter

Is the SolaX X3H-ULT-25K AFCI compatible with high-voltage solar battery systems?

Yes. The SolaX X3H-ULT-25K AFCI is a hybrid inverter platform designed for high-voltage battery integration, with an official battery voltage range of 120 – 800 V and maximum battery charge/discharge current of 60 A. Installers should always confirm the latest approved battery compatibility list and firmware requirements before commissioning.

Can the PV array be oversized on the SolaX X3H-ULT-25K?

Yes. The X3H-ULT-25K AFCI supports up to 200% PV oversizing and has a recommended PV array size of up to 50,000 Wp. This makes it a strong option for solar panels with multiple roof orientations, high-power modules, and commercial energy storage designs that aim to maximize annual yield.

Does the SolaX X3H-ULT-25K support backup or EPS operation?

Yes. The inverter supports EPS functionality with UPS-level switchover time below 10 ms and peak EPS output power up to two times rated power for 10 seconds. Final backup performance depends on battery configuration, system design, local wiring rules, and commissioning settings.

Is the SolaX X3H-ULT-25K suitable for parallel and microgrid applications?

Yes. The X3H-ULT-25K AFCI is part of the SolaX X3-ULTRA platform, which supports up to 10 units in parallel for on-grid and off-grid operation and includes microgrid and generator functionality for versatile commercial and industrial system design.

Is the SolaX X3H-ULT-25K AFCI a good choice for commercial solar PV and energy storage projects?

Yes. With 25kW three-phase output, 3 MPPTs, 50kWp recommended PV input, high-voltage battery support, smart load management, and strong backup capability, the SolaX X3H-ULT-25K AFCI is designed for demanding commercial solar inverter, solar battery, and energy storage applications as well as high-end complete solar kits.

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Specification

Manufacturer

Brand	Solax Power

Technical Specifications

Weight	47 kg
Dimensions	696 × 526 × 240 mm
Product Category	Hyibrid Inverters, Inverters
Brand	Solax Power
PhasesDescribes the electrical phase configuration—Single-phase for residential use, Three-phase for commercial or industrial systems, and Split-phase common in North American households.	Three PhaseCommercial and industrial power standard with 400 V three-phase supply.
Rated Power [W]Indicates the maximum continuous power output or input the device can handle under standard operating conditions, measured in watts (W).	25 kW
Nominal AC Power [W]Nominal AC power refers to the rated output power of an inverter in alternating current (AC) form under standard operating conditions. It is usually expressed in watts (W) and represents the maximum continuous power an inverter can supply to an AC load without causing any damage or operational issues.	25kW
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.	400V
Nominal Current [A]Nominal current is essentially the normal electrical current that we would expect to flow through a circuit at any given time.	36.3A
Nominal AC frequency [Hz]Nominal frequency is the frequency specified by the manufacturer or supplier for a device in normal operation. 60Hz systems tend to be more efficient for longer distance transmission and are better suited for high-power applications, while 50Hz systems are more suited for low-power, local distribution. In the U.S. and many other places it is 60Hz. In Europe and many other places it\'s 50Hz.	50Hz, 60Hz
Inverter TypeAn inverter type refers to the specific technology and functionality of a solar inverter. The main types include grid-tied, off-grid, and hybrid inverters. Each serves a different purpose:	Hybrid, On-Grid (Grid Tie)
Max. PV array input power [Wp]The PV array power is the maximum power of the PV modules connected to one PV inverter.	50000W
Max. continuous output power [VA]As a unit of measurement for electrical power, VA represents how much energy a device consumes or produces or how much current it draws from the electrical circuit. In electrical circuits, power is measured in volts (V), as well as in amperes (A).	25000
DC Startup voltage [V]The start-up voltage for a solar inverter is the minimum voltage required to initiate its operation. This voltage is crucial as it marks the point at which the inverter begins converting DC power from the solar panels into AC power for consumption.	200V
Max. PV input voltage [V]Maximum PV voltage, which is an absolute limit of the voltage of PV panels connected in series, and “nominal PV power”. If more wattage is available from the panels, the controller won\'t use it, it will just limit the current to what it can handle.	1000V
MPPT Voltage Range [V]The MPPT (Maximum Power Point Tracking) voltage range refers to the range of input voltages at which an MPPT solar charge controller or inverter can operate efficiently to optimize the power output of a solar panel or array.	160V – 950V
No. of MPP Trackers (MPPT)An MPPT, or maximum power point tracker is an electronic DC to DC converter that optimizes the match between the solar array (PV panels), and the battery bank or utility grid via the solar inverter. To put it simply, they convert a higher voltage DC output from solar panels (and a few wind generators) down to the lower voltage needed to charge batteries. Maximum Power Point Tracking (MPPT) is a feature built into all grid tied solar inverters. In the simplest terms, this funky sounding feature ensures that your solar panels are always working at their maximum efficiency, no matter what the conditions.	3
No. of PV StringsThe maximum string size is the maximum number of PV modules that can be connected in series and maintain a maximum PV voltage below the maximum allowed input voltage of the inverter. The solar cell module is a unit array in the PV generator. It consists of solar cells connected in series to build the driving force and in parallel to supply the required current. A series-connected group of cells are called a solar cell string.	6
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.
Battery Voltage Range [V]Indicates the allowable DC voltage window in which the solar battery or energy storage system operates safely. Ensure compatibility with the selected solar inverter and hybrid inverter input voltage range.	180 V – 800 V
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.	60 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, WIFI
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.	IP66Completely dust-tight (no ingress of dust, objects, or airborne debris permitted) Protects against splashing, falling, or dripping water. Protects against hose-directed water, from any direction, using a nozzle of 12.5 mm or smaller at higher pressures.
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

The information on this page is a general summary. For exact specifications, safety instructions, and compliance details, please refer to the product datasheet or the manufacturer’s website. Always follow applicable regulations and consult a licensed installer. For further assistance, contact 3Buy Solar.

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SolaX Power is renowned for providing innovative energy solutions, including advanced solar inverters, batteries, and energy management systems designed for homeowners, businesses, and utilities. Their product portfolio is expansive, covering Photovoltaic (PV) inverters, energy storage solutions, Electric Vehicle (EV) chargers, and advanced smart energy management systems.

One of their standout offerings is the Energy Storage Inverters, designed for easy installation and can be mounted on any wall or installed in a garage or utility room. These inverters offer multiple modes of operation, such as Grid-tie, Grid-tie with battery backup, and Off-grid modes, providing flexibility and options for various customer needs.

SolaX Power also boasts the X-ESS G4, a new generation energy storage system characterized by its all-in-one, lightweight, and powerful design. This system is part of SolaX's commitment to advancing solar technology and making energy storage systems more accessible to families, gradually replacing non-renewable resources.

Another notable product is the SolaX TRIPLE POWER battery, which offers a 5.8kWh model that can be installed in series with up to 4 batteries, enabling up to 23kWh of storage. This battery utilizes the latest in LFP (Lithium Ferro Phosphate) technology, ensuring safer installations with wider temperature tolerances. It comes with a 10-year warranty and maintains 90% of its capacity at a 90% depth of discharge.

SolaX Power's energy storage solutions have garnered esteemed recognition, including awards like the "Red Dot Design Award 2021" and the TÜV Rheinland "All Quality Matters" award. These accolades highlight the company's dedication to quality, design, and innovation in the solar and storage solutions sector. System monitoring is solved via SolaxCloud.

"I'm loving my Solax inverter! Seriously, the way it smoothly switches between different power sources is absolutely impressive. I used to stress out about sudden blackouts or annoying disruptions, but not anymore!"

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SolaX X3-ULT-25K AFCI Hybrid Solar Inverter – 25kW 3-Phase Energy Storage Solution

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Product description

SolaX X3-ULT-25K AFCI – 25kW Hybrid Solar Inverter with Integrated Arc Fault Protection for Commercial PV Systems

Electrical Performance & PV Input Architecture

Hybrid Energy Storage & Solar Battery Integration

AFCI Safety System – Arc Fault Detection & Fire Prevention

Smart Hybrid Control & Energy Management

Backup Power & EPS Capability

Mechanical Design & Installation

Applications & Use Cases

Why Choose SolaX X3-ULT-25K AFCI

Compliance & Product Family Downloads

Product Datasheet and Downloads

FAQ: SolaX X3H-ULT-25K 25kW Hybrid Solar Inverter

Specification

Manufacturer

Technical Specifications

Related Products

Customer Reviews

Reviews

Contact 3Buy Solar:

SolaX X3-ULT-25K AFCI Hybrid Solar Inverter – 25kW 3-Phase Energy Storage Solution