Coming soon: The 20kWh ECO is due in mid-February 2027. Hit Notify Me and we'll email you as soon as it's available to order.
The Fogstar Energy 48V 20kWh ECO battery is a fully assembled, commercial-grade energy storage solution built for homes and small commercial installs, giving you more storage from a single unit, long cycle life and seamless inverter integration.
It keeps everything people like about our 16.1kWh ECO and adds more capacity, a new PACE battery management system and an 8-year warranty. A built-in heating system enables charging all the way down to -10°C, so cold garages, outbuildings and winter installs are no longer a problem.
Built using REPT 3.2V 392Ah Grade A cells in a 1P16S configuration, managed by an intelligent 200A PACE BMS with built-in Wi-Fi and Bluetooth and 2A active balancing, this system delivers long life, stable performance and peace of mind as standard.
Key Features
✓ Suitable for Home Installation
Within the 20kWh per-unit limit set by PAS 63100:2024 for battery storage in dwellings. For more info on PAS 63100:2024 regulations, click here to read the Fogstar Blog post covering all aspects of this.
Fully Assembled
Fully assembled and ready to install straight out of the box.
Indoor Installation
IP20 rated, suitable for indoor installation.
Integrated Fire Suppression
Built in as standard.
Cold-Weather Ready
Integrated battery heating allows charging down to -10°C.
Scalable & Flexible
Connect up to 16 units. That’s up to 320kWh of storage.
Reliable Performance
8-year manufacturer’s warranty, backed by 10 years of Fogstar customer support.
Long Lifespan
Built with REPT Grade A cells, backed by a capacity retention warranty of 8,000 cycles at 70% DoD.
Seamless Integration
Pre-loaded communication protocols support compatibility with Fogstar x LuxPowerTek, Sunsynk, Solis, Victron and other compatible inverters, including those using the Pylontech protocol.
Smart Connectivity
CAN and RS485 communication for smooth system integration.
Wi-Fi and Bluetooth
Built into the PACE BMS, alongside CAN and RS485.
User-Friendly Interface
Integrated 3.5in LCD touchscreen for real-time monitoring and configuration.
Advanced Cell Management
Advanced 200A PACE BMS paired with a 2A Active Balancer for optimal cell health.
Product 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, built into the BMS
Active Balancer: 2A
Weight: 143kg
Size: 898.5mm (H) x 415mm (L) x 260mm (W)
Enclosure: IP20, suitable 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: The battery is warranted for 8,000 cycles at a depth of discharge (DoD) of 70%, retaining a minimum of 70% of its original capacity, subject to the warranty terms and operating conditions.
Recommended accessory
Connecting multiple batteries in parallel?
The Fogstar Energy 800A Busbar connects up to four 48V batteries and two inverters, with a choice of fuse rating. Battery capacity and discharge capability should always be matched to your inverter output and expected system demand.
View the 800A Busbar →Not sure which inverter you need? Email customerservice@fogstar.co.uk or use our installer map to find your nearest Fogstar Approved Installer.
What's Included?
- 1.5m 50mm² battery cables with M8 ring lugs, suitable for direct inverter connection or via an external busbar.
- 1.5m communication cable for fast, hassle-free data integration.
Installation note: always connect all negative conductors before attaching the positive. Tighten the M8 terminals to 17Nm.
The supplied cables work with most inverter setups. In some installations, routing via a busbar and using manufacturer-supplied inverter leads may be required.
➡️ Download Specification Sheet
The user manual and warranty booklet for the 20kWh ECO are coming soon.