This product is a single 16.1kWh expansion battery module with the cables for your chosen expansion. You will need a control unit and base plate.
Next available batch arriving February 2027. Orders placed before this update are unaffected and will ship as originally scheduled.
Choose your expansion: Pick how many modules your stack has now and how many it will have after adding this one, and we'll include the right cables.
- 1 → 2 modules (16.1kWh → 32.2kWh)
- 2 → 3 modules (32.2kWh → 48.3kWh)
- 3 → 4 modules (48.3kWh → 64.4kWh)
This battery is designed specifically for customers expanding an existing Fogstar Energy Modular Battery Stack system that already has a compatible control unit installed. This product cannot operate as a standalone battery system without the required stack control hardware.
The Fogstar Energy 16.1kWh Expansion Battery Module is a high-capacity LiFePO₄ battery designed specifically for expanding existing Fogstar Energy Modular Battery Stack systems.
Supplied as a single 16.1kWh battery module with the cables for your expansion, this product allows existing systems to increase storage capacity quickly and efficiently without replacing the original stack infrastructure.
Designed for seamless integration and future scalability, the expansion module connects directly into compatible Fogstar Energy battery stack systems, allowing installations to grow alongside increasing energy demands.
With IP65-rated construction, integrated heating and LiFePO₄ cells, the module is engineered for reliable long-term operation in both residential and commercial environments.
Key Features
✓ Suitable for Home Installation
This 16.1kWh module is 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.
Expansion Module with Cables
One 16.1kWh module, supplied with the interconnection, power and communication cables for your chosen expansion.
No Control Unit Included
This product does not include the stack control unit, LCD interface, base plate or main breaker assembly. It works with the control unit, touchscreen and breaker already fitted to your stack.
Seamless Stack Integration
Directly integrates with existing Fogstar Energy control units and battery stack configurations.
Scalable Energy Storage
Scales from a single 16.1kWh module up to a full 64.4kWh stack of four modules.
IP65-Rated Construction
Robust, sealed enclosure protects against dust and moisture, making the system suitable for indoor and outdoor installations.
Integrated Fire Suppression
Built-in, heat-activated aerosol fire suppression system provides fast, automatic internal protection with no ongoing maintenance.
Cold-Weather Ready
Integrated heating system enables safe charging at low temperatures.
JK Active Cell Balancing
2A active balancing continuously equalises cell voltages, improving efficiency, stability and overall battery lifespan.
Advanced Cell Management
150A SEPLOS BMS for reliable system protection and stable performance.
High Output Performance
LV 51.2V (48V) system designed to support high-demand inverters and large backup or off-grid installations.
Long-Term Peace of Mind
Backed by a 6-year warranty and 10 years of UK-based customer service support.
Compatibility Notice
This expansion battery module is intended for use only with compatible Fogstar Energy Modular Battery Stack systems already fitted with:
- Stack control unit
- LCD touchscreen interface
- Battery base plate
- Main breaker assembly
Customers purchasing this product for a new installation will also require the appropriate control unit and stack hardware.
16.1kWh Product Specifications
Rated Energy: 16.1kWh
Nominal Voltage (V): 51.2V
Operating Voltage (V): 43.2V – 57.6V
Cycle Life: 8,000 cycles at 91% DOD
Configuration: 16S1P
Working Temperature: 0°C – 45°C Charge (with heating) and –20°C – 45°C Discharge
Maximum Discharge Current: 150A
Maximum Charge Current: 150A
Capacity: 314Ah
Communications: CAN / RS485
Ingress Protection: IP65
What's Included?
Included with this product:
- 1 × 16.1kWh battery module
- Battery interconnection and power cables for your chosen expansion
- Communication cable
Not included:
- Stack control unit and LCD touchscreen
- Battery base plate
- Main breaker assembly
For correct installation, all negative connections must be made before connecting the positive.
➡️ Download Specification Sheet
➡️ Download User Manual
➡️ Download Installation Wiring Guide
➡️ Download Warranty Booklet