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Battery series · FoxESS · 6 sizes, all CEC-active
6 sizes from 8.388 to 29.349 kWh usable, from below the smaller-home band to the medium home band. This page is for picking the size.
The Fox ESS ECS is a modular battery designed to pair with Fox ESS hybrid inverters. It comes in two module sizes, listed on the CEC register as the ECS2900 and the ECS4800 series. Each stacks from 2 to 7 modules. On the register, the ECS2900 runs from 5.18kWh usable (2 modules) to 18.14kWh usable (7 modules). The larger ECS4800 runs from 8.39kWh usable (2 modules) to 29.35kWh usable (7 modules). Choosing the module size and count lets a system be sized to the household rather than rounded up to a fixed block. It is designed for Fox ESS hybrid inverters, so it suits an all-Fox setup. Check backup and monitoring features with your installer for the inverter you choose. For Perth homeowners, the modular design avoids overbuying, and Fox ESS is still building its long-term Australian track record.
Each size is its own CEC listing with its own page. Household bands are the owner’s guide; rebate fit is against the WA scheme’s cap.
| Usable capacity | Household band | WA rebate fit | Page |
|---|---|---|---|
| 8.388kWh | Below the smaller-home band | Under the cap | Full specs, 8.388 kWh |
| 12.582kWh | Smaller home (10–15 kWh) | Closest fit to the cap | Full specs, 12.582 kWh |
| 16.776kWh | Between smaller home and medium home | Over the cap | Full specs, 16.776 kWh |
| 20.97kWh | Medium home (20–30 kWh) | Over the cap | Full specs, 20.97 kWh |
| 25.164kWh | Medium home (20–30 kWh) | Over the cap | Full specs, 25.164 kWh |
| 29.349kWh | Medium home (20–30 kWh) | Over the cap | Full specs, 29.349 kWh |
The WA Battery Scheme pays $130 per kWh on the first 10 kWh, capped at $1,300. Capacities under 5 kWh receive nothing, and every capacity from 10 kWh up receives the same $1,300 — a larger battery does not earn a larger rebate. Whether a particular product qualifies also depends on it being Synergy-approved. “Over the cap” does not mean you should not buy it — the extra capacity is simply at full price. Figures come from each size’s own CEC listing; SBP holds no verified per-size pricing for this series.
Compare quotes from installers you choose
Pairings curated from the manufacturer’s documentation — the CEC register does not list them.
Product specifications, pricing, and availability are subject to change without notice. We make no warranties regarding product performance, longevity, or suitability for your specific needs.
Always verify specifications with the manufacturer and installer before purchase. Warranty terms are set by manufacturers and may have conditions not disclosed here. Battery performance degrades over time.