Description
The Fox ESS S22 is a compact, all-in-one battery storage system designed for smaller residential solar installs. With 800W rated power and 2.11kWh usable storage, it delivers reliable backup and day-to-day savings — without the complexity of separate components. Installation is fast and fuss-free, making it a favourite among UK installers looking to streamline smaller PV setups.
Why Choose This Product?
- All-in-one simplicity: Built-in inverter, battery, and safety protections in a single unit
- High usable capacity: 90% DoD for dependable daily cycling
- EPS backup: Optional emergency power supply keeps key circuits running during outages
- Weather-ready: IP65 rating and integrated heating for outdoor or cold-climate installs
- Quick install: Floor-mounted, plug-and-play with minimal wiring
- Smart monitoring: Connects to FoxCloud V2.0 and smartphone app for full system visibility
- Stackable: Expand storage up to 8.44kWh with additional S22 modules
Performance and Design
The S22 delivers 800W continuous power with a peak output of 1.2kVA, making it well suited for lighting, routers, fridges, and other priority loads. The system uses lithium iron phosphate (LiFePO₄) chemistry for safety and long-term reliability, with a lifespan of over 6,000 cycles at 90% depth of discharge. Thanks to its compact footprint and minimalist design, it fits neatly into tight spaces — ideal for UK homes with limited utility areas.
Monitoring and Connectivity
Fox ESS includes full cloud-based monitoring via the FoxCloud V2.0 portal, plus Bluetooth, Wi-Fi, LAN and RS485 interfaces for local access. Homeowners and installers can track performance, alerts and SOC (state of charge) from a smartphone or PC. Built-in OLED display and battery LED indicators give quick visual feedback on status and alarms.
Who is it for?
- Domestic retrofits: Homeowners looking to add basic storage to an existing solar array
- Small new-builds: Developers and architects working with compact sites or flats
- Installers: Professionals needing a low-hassle, all-in-one system for quick installs
Technical Specifications
| Model | S22-M-H | S22-M-AC | S22-S |
|---|---|---|---|
| Battery Type | LiFePO₄ | ||
| Nominal Energy | 2.11kWh | ||
| Rated Output Power | 800W | 800W | 800W |
| EPS Output | 1200VA | 1200VA | 1200VA |
| Nominal Voltage | 220/230/240V | ||
| Frequency | 50/60Hz | ||
| Cycle Life | >6000 (at 90% DoD) | ||
| Installation | Floor-mounted | ||
| IP Rating | IP65 | ||
| Operating Temp | -20°C to 55°C | ||
| Weight | 26.5kg | 25.5kg | 24kg |
| Dimensions (W×H×D) | 420×285×255mm | 420×285×255mm | 420×270×220mm |
| Smart Meter | Optional | Optional | Optional |
| Battery Warming | Optional | Optional | Optional |
| Monitoring | FoxCloud 2.0, OLED Display, Wi-Fi, Bluetooth, LAN, RS485 | ||
Each unit supports up to 4 stackable batteries (8.44kWh total).
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