Fox ESS EVO 10
The Fox ESS EVO 10 stores 9.73 kWh usable (calculated from the datasheet). All-in-one: battery with built-in hybrid inverter (solar connects on the DC side). Running essentials only, a full EVO 10-5-H (5 kW) lasts about 2 days 11 hours in a power cut.
An all-in-one battery and hybrid inverter with 10.24 kWh of LFP storage, sold in 5, 8 and 10 kW versions. Up to three units can run in parallel.
Last checked 26 Sept 2026 · Sources listed at the bottom of the page
- Usable capacity is calculated (10.24 kWh × 95% depth of discharge); Fox ESS does not state a usable figure in this datasheet.
- Round-trip efficiency is not stated; the datasheet gives a 96.4% battery-to-AC figure at full load, which is one direction only.
How long will it run your home?
Pick a setup and tick what you want to keep running. The maths is shown below the result.
Average draw 156 W from 9.24 kWh available.
Everything on at once: 415 W — within the 5 kW limit
- Starts from a full battery with 0% held back as reserve.
- 5% extra allowed for wiring and standby losses on top of the manufacturer's usable figure.
- Appliance figures are typical averages; your own may differ. Enter your own wattage for the most accurate result.
- Assumes no solar recharging during the outage.
Setups you can buy
| Setup | Usable energy | Continuous power |
|---|---|---|
| EVO 10-5-H (5 kW) | 9.73 kWhcalculated | 5 kW |
| EVO 10-8-H (8 kW) | 9.73 kWhcalculated | 8 kW |
| EVO 10-10-H (10 kW) | 9.73 kWhcalculated | 10 kW |
Full specifications
| Specification | Value | Source |
|---|---|---|
| Capacity | ||
| Usable capacity (per unit) | 9.73 kWhcalculatedCalculated; the datasheet gives total energy and depth of discharge, not usable energyHow: 10.24 kWh battery energy × 95% depth of discharge = 9.73 kWh | Fox ESS datasheetp.2, Battery Connection |
| Total (nominal) capacity | 10.24 kWh | Fox ESS datasheetp.2, Battery Connection |
| Depth of discharge | 95% | Fox ESS datasheetp.2, Battery Connection |
| Battery chemistry | LFP (LiFePO₄) | Fox ESS datasheetp.2 |
| System | ||
| Maximum usable storage (expanded) | 29.18 kWhcalculatedCalculated from parallel limit and usable capacityHow: 3 units × 9.73 kWh usable | Fox ESS datasheet |
| How it expands | Up to 3 EVO units in parallel | Fox ESS datasheetp.2, EPS output: Parallel operation |
| Maximum system power (expanded) | Not documented in the sources we hold | |
| Architecture | All-in-one: battery with built-in hybrid inverter (solar connects on the DC side) | Fox ESS datasheetp.1 |
| Grid connection | Single phase, 220/230/240 V | Fox ESS datasheetp.2 |
| Power | ||
| Continuous power (per unit) | 5–10 kWEVO 10-5-H: 5 kW · EVO 10-8-H: 8 kW · EVO 10-10-H: 10 kW | Fox ESS datasheetp.2, AC output rated power |
| Peak power | 10–20 kWBackup (EPS) peak for 10 seconds: 10 / 16 / 20 kVA by model | Fox ESS datasheetp.2, EPS output |
| Peak duration | 10 s | Fox ESS datasheetp.2, EPS output |
| Max charge power | Not documented in the sources we hold | |
| Round-trip efficiency | Not documented in the sources we hold | |
| Solar | ||
| Max solar input | 16–20 kWMax PV array: 16 kWp (5 kW model), 20 kWp (8 and 10 kW models) | Fox ESS datasheetp.2, PV input |
| Solar MPPT inputs | 2 (5 kW model) or 3 (8 and 10 kW models) | Fox ESS datasheetp.2 |
| Backup | ||
| Backup switchover time | 4 msLess than 4 ms | Fox ESS datasheetp.2, EPS switch time |
| Backup needs | Built-in EPS (backup) output | Fox ESS datasheetp.1–2 |
| Physical | ||
| Ingress rating | IP66 | Fox ESS datasheetp.2 |
| Indoor / outdoor | Indoor and outdoor (IP66)calculatedHow: IP66 rating and −20 to 55°C range | Fox ESS datasheetp.2 |
| Operating temperature | −20°C to 55°C | Fox ESS datasheetp.2 |
| Dimensions | 584 × 1009 × 197W × H × D | Fox ESS datasheetp.2 |
| Weight | 113 kg | Fox ESS datasheetp.2 |
| Mounting | Floor or wall | Fox ESS datasheetp.2 |
| Warranty | ||
| Stated cycle life | 6,000 cycles | Fox ESS datasheetp.2 |
| Warranty (UK) | 12 years | Fox ESS warrantyp.2, performance warranty table |
| Capacity guaranteed at end of warranty | 70%70% of nominal energy | Fox ESS warrantyp.2 |
| Warranty throughput limit | 47.88 MWhWhichever comes first: 12 years or 47.88 MWh | Fox ESS warrantyp.2, EVO10 row |
| Warranty conditions | Not documented in the sources we hold | |
| Compliance | ||
| UK grid compliance | G99 | Fox ESS datasheetp.2, Grid regulation |
Questions people ask
How much usable capacity does the Fox ESS EVO 10 have?
9.73 kWh (Calculated; the datasheet gives total energy and depth of discharge, not usable energy). This figure is calculated: 10.24 kWh battery energy × 95% depth of discharge = 9.73 kWh.
Can the Fox ESS EVO 10 be expanded?
Up to 3 EVO units in parallel. Maximum usable storage: 29.18 kWh (calculated).
How long will the Fox ESS EVO 10 run a house in a power cut?
Running essentials only (fridge-freezer, lights, Wi-Fi, TV and device charging, about 156 W on average), a full EVO 10-5-H (5 kW) lasts roughly 2 days 11 hours. Heavy loads such as a heat pump, electric shower or EV charger cut this sharply. Use the calculator on this page with your own appliances.
What warranty does the Fox ESS EVO 10 have in the UK?
12 years, guaranteeing 70% of capacity or 47.88 MWh of throughput, whichever comes first.
What does the Fox ESS EVO 10 need to provide backup power?
Built-in EPS (backup) output.
Compare with
Tesla Powerwall 3
An all-in-one home battery with a built-in solar inverter. One unit stores 13.5 kWh and can be expanded with up to three Expansion units.
Sigenergy SigenStor
A stackable system: a Sigen Energy Controller (hybrid inverter) with 1–6 battery modules of 5.2 or 7.8 kWh usable each.
Enphase IQ Battery 5P
An AC-coupled 5 kWh battery with six built-in microinverters, so it can be added to most existing solar systems. Up to seven can be combined in the UK.
myenergi libbi
A UK-designed modular battery with a 3.68 kW or 5 kW hybrid inverter and 1–4 battery modules (4.6 kWh usable each). Built to work with myenergi's zappi and eddi.
Sources
- EVO 10 Datasheet (UK) V1.0 — Fox ESS, V1.0. Retrieved 26 Sept 2026. Official Fox ESS UK file (PDF title EN-EVO-10-datasheet-UK-V1.0-20250430); fetched from a UK distributor mirror because the official host blocks automated downloads.
- Fox ESS Battery Warranty Policy (UK) Version 4.5 — Fox ESS, 4.5. Retrieved 26 Sept 2026. Manufacturer warranty policy hosted by UK distributor Midsummer Wholesale.
Spotted an error? Every figure above links to the document it came from. See how we check data.