Fogstar Energy ECO 48V 20kWh Solar Battery
Available to pre-order: The 20kWh ECO is due in mid-February 2027. Pre-order now to secure yours and we'll dispatch it as soon as stock arrives.
The 48V 20kWh ECO from Fogstar Energy is a commercial-grade battery storage system, supplied fully assembled, for domestic and small commercial installations – offering greater capacity from one unit, a long cycle life and seamless integration with your inverter.
Building on the popular 16.1kWh ECO, it adds extra capacity, a new PACE battery management system and an 8-year warranty. Thanks to a built-in heating system, it can charge at temperatures as low as -10°C, making it well suited to cold garages, outbuildings and installations through the winter.
Inside are REPT 3.2V 392Ah Grade A cells in a 1P16S arrangement, controlled by an intelligent 200A PACE BMS featuring integrated Wi-Fi and Bluetooth plus 2A active balancing, giving long service life, consistent performance and peace of mind as standard.
Main Features
✓ Suitable for Domestic Installation
Falls within the 20kWh-per-unit limit for battery storage in dwellings set out in PAS 63100:2024. For more info on PAS 63100:2024 regulations, click here to read the Fogstar Blog post covering all aspects of this.
Supplied Fully Assembled
Arrives fully assembled and ready to install as soon as it's unboxed.
For Indoor Use
IP20-rated enclosure, designed for indoor installation.
Built-In Fire Suppression
Included as standard.
Designed for Cold Conditions
Built-in battery heating enables charging at temperatures down to -10°C.
Expandable System
Up to 16 units can be connected together, for as much as 320kWh of storage.
Dependable Support
Covered by an 8-year manufacturer's warranty, with 10 years of Fogstar customer support.
Long Service Life
Uses REPT Grade A cells and is covered by a capacity retention warranty of 8,000 cycles at 70% DoD.
Inverter Compatibility
Pre-loaded communication protocols enable compatibility with Fogstar x LuxPowerTek, Sunsynk, Solis, Victron and other compatible inverters, including those that use the Pylontech protocol.
Communication
CAN and RS485 communication for straightforward system integration.
Wi-Fi & Bluetooth
Integrated into the PACE BMS, in addition to CAN and RS485.
Touchscreen Display
Built-in 3.5in LCD touchscreen for live monitoring and set-up.
Cell Management
A 200A PACE BMS works alongside a 2A Active Balancer to keep cells in optimal condition.
Technical Specifications
Rated Energy: 20.00kWh
Model: FE-51.2-20-ECO-P
Nominal Voltage (V): 51.2V
Operating Voltage (V): 43.2V - 57.6V
Capacity Retention Warranty: 8,000 cycles at 70% DoD
Cells: REPT 3.2V 392Ah Grade A LiFePO4
Cell Assembly: 1P16S
Working Temperature: -10°C - 40°C Charge. -20°C - 40°C Discharge
Rated Charge/Discharge Current (A): 200A/200A @25±2℃
Maximum Discharge Current: 200A
Capacity: 392Ah
BMS: PACE 200A
Wireless: Wi-Fi and Bluetooth, integrated into the BMS
Active Balancer: 2A
Weight: 143kg
Dimensions: 898.5mm (H) x 415mm (L) x 260mm (W)
Enclosure: IP20, for indoor installation
Pre-loaded compatibility: Fogstar x LuxPowerTek, Sunsynk, Solis, Victron and other compatible inverters, including those using the Pylontech protocol
Capacity retention warranty: Over 8,000 cycles at 70% depth of discharge (DoD), the battery is warranted to keep at least 70% of its original capacity, subject to the warranty terms and operating conditions.
Suggested accessory
Running multiple batteries in parallel?
The Fogstar Energy 800A Busbar links up to four 48V batteries and two inverters, and is available with a choice of fuse ratings. Always size battery capacity and discharge capability to suit the inverter output and the anticipated system load.
See the 800A Busbar →Need help choosing an inverter? Contact customerservice@fogstar.co.uk or find your nearest Fogstar Approved Installer using our installer map.
In the Box
- 1.5m 50mm² battery cables fitted with M8 ring lugs, for connection directly to the inverter or through an external busbar.
- 1.5m communication cable for quick, simple data integration.
Installation note: connect every negative conductor before fitting the positive. Torque the M8 terminals to 17Nm.
The cables supplied suit most inverter configurations. Some installations may need the connection routed through a busbar, using the inverter manufacturer's own leads.
➡️ Download Specification Sheet
The user manual and warranty booklet for the 20kWh ECO are coming soon.