Growatt Off-Grid Energy Storage System with 3.5kW 48V Inverter, from 5.12kWh to 25.64kWh LiFePO4 Batteries, and 4.4kW Solar Panels

By Iconica


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 Introducing the Growatt Off-Grid Energy Storage System: Ultimate Power and Flexibility

The Growatt Off-Grid Energy Storage System features a state-of-the-art lithium iron phosphate (LiFePO4) battery with a flexible capacity range from 5.12kWh to 25.64kWh. This advanced system is perfect for residential off-grid battery storage and also ideal for small business and industrial use.

The battery system is modular and equipped with internal plugs, eliminating the need for extra cable connections. All external cables are integrated into one plug, simplifying the connection to the inverter. Each module has an internal plug connection, and the battery pack connects quickly to the inverter with a single cable harness

Unmatched Safety and Durability: The system includes cell security monitoring and balancing for enhanced safety. As a cobalt-free LFP battery, it offers high-temperature resistance, safety, and stability. With up to 6,000 charge cycles, the Growatt ARK 2.5L-A1 LV battery system has an expected service life of more than 10 years. It is designed to efficiently use and manage electrical energy, providing a stable electricity supply and cost-saving opportunities, such as charging the battery during low-priced nighttime hours.

Seamless Integration and Continuous Power Supply: By integrating the system with solar panels or a generator, you can ensure a continuous and reliable power supply 24/7 for your home.

Off-Grid Energy Storage System Includes:

Installation and Delivery: The price includes a basic set of cables, protection disconnectors, and accessories required for a fully operational system. User manuals and a connection diagram are supplied with your order. Mounting is not included—if you require a mounting system, select a suitable option here or contact us for advice.

The system must be installed by a licensed electrician or technician in compliance with all applicable regulations and guidance. For residential properties, please see the guidance here.

  • GROWATT ARK 2.5L-A1 2.56KWH LITHIUM-ION (LFP) SOLAR BATTERY MODULE: Developed with Growatt's own lithium iron phosphate cells and vertical industry integration, ensuring the highest safety and a life cycle of 6,000 cycles at a 90% Depth of Discharge. It includes a self-designed Battery Management System protecting against abnormal temperature, current, voltage, State of Charge, and the battery’s State of Health. Comes with a 10-year standard warranty covering all manufacturing or material faults.
  • GROWATT SPF 3500 ES 3.5KW 48V SINGLE PHASE OFF-GRID INVERTER: Combines a 3500W pure sine wave inverter, 80A MPPT solar charge controller, and a 60A smart battery charger in one unit. It can accept input from solar panels, mains power, a generator, or a battery from multiple sources. The inverter generates 3500W of continuous AC power and up to 7000W at peak times. The inbuilt 80A MPPT solar charge controller operates at up to 98% efficiency. The inbuilt 80A smart battery charger enables safe and efficient charging from mains power or a generator.
  • CANADIAN SOLAR 440W TOPHIKU6 MONO BLACK FRAME MC4 SOLAR PANELS: Reliable, efficient, and cost-effective with a high efficiency of 22.5%. They can withstand a heavy snow load up to 5400Pa and an increased wind load up to 2400Pa. The panels come with a 25-year product warranty

    Delivery: Free 2-3 working days' delivery within the UK (longer to the Highlands, Islands, and Northern Ireland).

    Rated (Peak) Power (Wp): 440W in Standard 1000w/m2 solar light
    Open Circuit Voltage (Voc): 39.40V (Vmp =32.40V)
    Short Circuit Current (Isc)14.01A (Imp = 13.59A)
    Cell TypeMono-crystalline Silicon
    Connector Type: MC4
    Certification: IEC 61215 / IEC 61730 / CE / INMETRO / MCS / UKCA
    Panel Size:  1722 X 1134 X 30 mm
    Net weight: 21.3kg
    Origin: China
    Nominal battery voltage: 48Vdc
    Continuous power output: 3500W/3500VA 220-240VAC 50Hz
    Surge power: 7000VA
    Output waveform: Pure sine wave
    Maximum solar input power: 4500W
    Maximum solar input current: 50-100A
    Maximum open circuit solar input voltage (Voc): 450V
    Solar MPPT operating voltage: 120-430V DC
    Maximum solar charging current: 80A
    Maximum mains AC charging current: 60A
    Peak Efficiency: 93%
    Transfer Time: 10ms typical, 20ms Max.
    Operating temperature: 0°C to 55°C
    Protection Degree: IP20
    Size:  330 x 485 x 135 mm
    Net Weight: 11.5kg


    Origin: China
    Battery Type: Lithium-Ferro-Phosphate (LFP)
    Nominal Capacity: 2560Wh
    Nominal Voltage: 48V
    Charge/Discharge Current: 50-100A
    Warranty: 10 years
    Communication Port: CAN
    Cycle Life: >6000 
    Installation Location: Indoor/Outdoor
    Cooling: Natural
    Scalability: Up to 6 units in parallel
    Operating Temperature: -10°C ~ +45°C
    IP Rating: IP65
    Net Weight: 30kg
    Size:  650 * 260 * 170mm

    • Quantity of batteries from 2x to 10x (depending on the chosen option) of Growatt ARK 2.5L-A1 2.56kWh Lithium-Ion (LFP) Solar Battery - 1 X Pallet, 
    • 1x Growatt SPF 3500 ES Off-Grid 3500W 48V Pure Sine Wave Inverter with Built-in 100A MPPT Solar Controller, 100A Mains Battery Charger, Parallel Capability and WI-FI (Option) - 1 X Box,
    • 1x set of cables, disconnectors, and accessories, and
    • 10x Canadian Solar 440W TOPHiKu6 Mono Black Frame MC4 Solar Panels - 1 X Double Pallet.
     For more information, call us on 020 8064 0335 or email