Off-Grid Energy Storage System with RIIO SUN II 2kW 24V Inverter, 5.9kWh 24V Lithium Battery, and Optional 3.2kW Solar Panels and 3kW Generator
Efficient, Affordable Power for Off-Grid Homes, Workshops and Cabins
Take control of your electricity with this affordable off-grid battery system. It lets you store power from solar panels or a generator and use it when you need it most.
The 5.5kWh Energy Storage System (5.5kWh ESS) includes:
- 1x FOGSTAR 24V 230Ah Lithium (LiFePO4) Battery (other capacities available on request)
- 1x RIIO SUN II Off-Grid 2000W 24V Pure Sine Wave Inverter Charger
- 1x Complete set of Cables, Connectors, Disconnectors, and Accessories
- Optional: Two strings of 3x JA Solar 535W Bifacial Mono PERC Half-Cell MBB LB Traceable Black Frame MC4 solar panels each, and
- Optional: 1x Könner & Söhnen KS 3300i 3000W Petrol Inverter Generator.
This compact system is ideal for off-grid setups in small cabins, remote workshops, and seasonal dwellings. Paired with solar panels and optionally supported by a generator, it delivers reliable, round-the-clock electricity.
The price includes cables, protection disconnectors, and accessories to complete the system. Manuals and a connection diagram are supplied. Mounting not included – if required, choose an option here or contact us for help.
The system must be installed by a licensed electrician or technician following all relevant safety regulations. For homes, see guidance here.
Need installation? We can help. Email us at info@energian.co.uk or call 020 8064 0335.
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Fogstar Drift 24V 230 Ah Lithium Battery is a high‑capacity 24 V LiFePO₄ battery aimed at motorhomes, boats, vans, and off‑grid systems that need more power than a 12 V bank but still want compact, smart, long‑life storage. It uses Grade A EVE LiFePO₄ prismatic cells in an 8S1P configuration, giving about 5.9 kWh of usable energy at 25.6 V nominal (often rounded to 24 V). Rated for about 4,000 cycles at 80% depth of discharge (DoD), which suits daily‑use off‑grid or live‑aboard scenarios. Bluetooth monitoring lets you check voltage, current, SoC, temperature, and cell balance via the Fogstar app, simplifying maintenance and fault‑finding. Built‑in automatic heating helps maintain performance in low temperatures and prevents charging below safe limits, useful for winter camping or marine use.
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Riio Sun II Off-Grid 2000W 24V Pure Sine Wave Inverter Charger is the innovative unit which combines the functions of a 2000W pure sine wave inverter, 80A MPPT solar charge controller, and 40A mains/generator battery charger in a single device. The inverter is compatible with input from 3,600W solar panels, mains power, a generator, or a battery, with the flexibility to use one or multiple input sources simultaneously.
The AGS (Automatic Generator Start) function is explicitly available on the RiiO Sun II series allowing the inverter to automatically start and stop a generator based on system conditions such as low battery voltage. The integrated 40A smart battery charger ensures safe, efficient, and unattended charging from mains power or a generator, with multiple charging stages and overcharge protection.
- Optional JA Solar 535W Bifacial Mono PERC Half-Cell MBB LB Traceable Black Frame MC4-EVO2A Solar Panels. These high-performance solar panels offer high 22.9% efficiency, excellent durability, and cost-effectiveness with an appealing payback period. With a heavy snow load capacity of 5,400Pa and a wind load of up to 2,400Pa, they are ideal for domestic, agricultural, or garden office installations. The panels feature a sleek black frame and come with a 30-year product warranty.
- Optional Könner & Söhnen KS 3300i 3000W Petrol Inverter Generator. The Könner & Söhnen KS 3300i is a German premium portable generator, providing a reliable and economical power source. With a maximum output of 3,300W (3.3kW) and a continuous output of 3,000W (3.0kW), it combines convenience with exceptional performance. Designed to operate quietly, this generator is well-suited for a wide range of applications.
FREE 4-5 WORKING DAYS' DELIVERY within the UK (including the Highlands, islands and Northern Ireland).
| FOGSTAR DRIFT GEN2 24V 230AH LITHIUM BATTERY |
| Origin: UK |
| Battery type: Lithium-Ferro-Phosphate (LiFePO4) |
| Nominal capacity: 230Ah |
| Nominal voltage: 25.6V (24V system) |
| Design life: 10 years at 20°C |
| Lifecycle: 4000+ cycles (20°C), at 80% depth of discharge |
| Installation location: Indoor/Outdoor (IP67) |
| Operating temperature: Discharge temperature range: –20 °C to +60 °C, Charge temperature range (with heater enabled): –20 °C to +60 °C. |
| Terminal: M8 Terminals |
| Net weight: 38kg |
| Size: 520 (L) x 238 (W) x 221 (H) |
| Nominal battery voltage: 24Vdc |
| Continuous power output: 2000W/2000VA 220-240VAC 50Hz |
| Surge power: 4000VA |
| Output waveform: Pure sine wave |
| Maximum solar input power: 3600W |
| Maximum PV input current: 36A |
| Maximum PV open circuit voltage (Voc): 150V |
| Solar MPPT operating voltage: 40-145V DC |
| Maximum mains/generator AC charging current: 40A |
| Maximum battery discharge current acceptance: 139A |
| MPPT efficiency: 98% |
| Operating temperature: -20°C to 64°C |
| Size: 499 x 272 x 144 mm |
| Net weight: 14kg |
| Rated (peak) power (Wp): 535W in standard 1000w/m2 solar light |
| Open circuit voltage (Voc): 44.13V (Vmp =37.03V) |
| Short circuit current (Isc): 15.31A (Imp = 14.45A) |
| Efficiency: 22.9% |
| Cell type: Mono-crystalline silicon |
| Connector type: MC4-EVO2 |
| Certification: IEC 61215 / IEC 61730 / CE |
| Panel size: 2063 X 1134 X 30 mm |
| Net weight: 28.8kg |
| Model: KS 3300i |
| Maximum power: 3300W 3.3kW |
| Continuous power: 3000W 3.0kW |
| Fuel consumption @ 50% load: 1L/hr |
| Phase: Single |
| Voltage: 220VAC |
| Frequency: 50Hz |
| Max/continuous current (Amps): 14.4A |
| Power factor (Cosφ): 1 |
| Engine model: KS 210i |
| Engine type: 4-stroke forced air-cooled |
| Engine size: 208cm3 |
| Max power output: 5.5hp |
| Fuel: Petrol |
| Fuel capacity: 7L |
| No. of cylinders: 1 |
| Features: ECO mode, low oil shutdown |
| Noise level @ 7m: 96db(A) |
| Net weight: 25.5kg |
| Fully assembled dimensions (H x W x L): 450 x 380 x 460mm |
- 1x FOGSTAR DRIFT GEN2 24V 230AH LITHIUM BATTERY - 1 X Pallet,
- 1x RIIO SUN II OFF-GRID 2000W 24V PURE SINE WAVE INVERTER CHARGER - 1 X Carton,
- 1x COMPLETE SET OF CABLES, CONNECTORS, DISCONNECTORS, AND ACCESSORIES,
- Optional 6x JA Solar 535W Solar Panels - 1 X Double Pallet,
- Optional 1x Könner & Söhnen KS 3300i Petrol Inverter Generator - 1 X Pallet.
If you have questions, please call us on 020 8064 0335 or email info@energian.co.uk.