Fox ESS EP/ECS review
By My Energy Mate Editorial · Last updated
7.2/10
Fox ESS sells aggressively priced modular LFP batteries (EP and ECS ranges, 5.2 to 40+ kWh) that undercut most rivals at roughly A$750 to A$900 per usable kWh installed. The hardware is capable, but surge output limits, a young brand history and patchy support reports make it a price-first rather than peace-of-mind choice.
Cons
- Limited backup surge power on many configurations
- Young brand, support reports are mixed
Limited backup surge power on many configurationsPros
- Consistently among the cheapest per-kWh in the market
- Modular LFP with 10-year warranty
Consistently among the cheapest per-kWh in the marketFox ESS EP/ECS models and prices
| Model | Usable kWh | Power kW | Chemistry | Warranty | Backup | Installed price | $/kWh |
|---|---|---|---|---|---|---|---|
| Fox ESS EP11 | 10.36 | 5.5 | LFP | 10 yrs | Yes | A$8,000–A$9,500 | A$845 |
Prices: installed with hybrid inverter, before applicable rebates.
Additional things to note about Fox ESS EP/ECS?
Fox ESS's disadvantages are backup performance and after-sales confidence: surge capacity on common configurations struggles with high-draw appliances during outages, and Australian support has drawn mixed reviews. It is best treated as a budget daily-cycling battery rather than a whole-home backup solution.
Compare against every rival in the full battery comparison table.
