bat-power-low on a Fox ESS battery: The battery power is low. Wait for the battery to be recharged
Short answer
On a Fox ESS battery, bat-power-low means: The battery power is low. Wait for the battery to be recharged. The battery keeps running with some functions stopped. The wording differs by model range — each is shown below.
Reviewed 24 September 2026 · 2 sources
What it means
On the EVO all-in-one
The manual says: The battery power is low. Wait for the battery to be recharged.
On the H1 G2 single-phase hybrid inverter
The manual says: The battery power is low.
Part involved: battery state of charge.
When it shows: Battery energy below minimum.
Likely causes:
- Battery depleted (normal after a long discharge or power cut).
Is it safe?
On the EVO all-in-one
| Does the battery stop? | Partly |
|---|---|
| Severity | Warning |
The battery keeps running with some functions stopped.
Resetting itself: unknown.
Manual reset: see solution.
On the H1 G2 single-phase hybrid inverter
| Does the battery stop? | Partly |
|---|---|
| Severity | Warning |
The battery keeps running with some functions stopped.
Resetting itself: yes.
Manual reset: Wait for the battery to be recharged.
What you can check
On the EVO all-in-one
- Read and note the exact code or light pattern and the time (photo or app screenshot).
- Normal when the battery is near its minimum/reserve level - it clears when solar or the grid recharges it. Check your minimum SoC settings in the Fox app.
- Never open the battery, inverter or gateway casing and never touch DC cables, connectors or battery terminals.
On the H1 G2 single-phase hybrid inverter
- Read the full code and message on the inverter screen or in the FoxCloud app and note the date/time for your installer.
- Check the inverter's AC isolator next to the inverter and the solar/battery breaker in the consumer unit are ON (do not reset a breaker that trips again - call your installer).
- Wait for sunshine or a cheap-rate charge window to recharge the battery; check your charge schedule/work mode in FoxCloud.
What the engineer will check
On the EVO all-in-one
- Follow the EVO Alarm List solution; check event history on the LCD/Fox Cloud; escalate to Fox ESS support with serial number.
Who to ask for: battery storage installer.
Certification: Fox ESS approved installer (Fox ESS warranty excludes repairs by unauthorised persons); MCS battery certification.
On the H1 G2 single-phase hybrid inverter
- If it never recharges: check work mode, min SoC settings, BMS comms and battery health.
Who to ask for: Battery/hybrid installer trained on the specific battery (manufacturer-approved installer).
Certification: Battery and hybrid-inverter DC work: installer trained/approved by the manufacturer; electrical work under BS 7671 by a competent person.
What you might notice
Sources
- EVO 5 / EVO 10 Series User Manual V1.0.0 (10-500-10451-00) ↗ · V1.0.0 · page 52 · Reviewed 24 September 2026
- H1(G2)/AC1(G2) Series User Manual ↗ · V1.0.8 · page 48 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026