Bat Volt Fault on a SolaX Power SolaX X1-Hybrid G3: Battery Voltage Fault
Short answer
On a SolaX Power battery, Bat Volt Fault means: Battery Voltage Fault. The battery keeps running with some functions stopped.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: Battery Voltage Fault.
Part involved: Battery voltage / state of charge.
Likely causes:
- As described in manual.
Is it safe?
| Does the battery stop? | Partly |
|---|---|
| Severity | Warning |
The battery keeps running with some functions stopped.
Resetting itself: usually - clears once the battery recharges from PV or grid.
Manual reset: sometimes (battery activation/force charge).
What you can check
- Read and note the exact code and time from the inverter display or app (screenshot).
- Check the battery is switched on and not paused in the app.
- Check reserve/charge settings in the app; in cold weather charging may pause below 0 C.
- Where the SolaX manual says 'press the ESC key to restart the inverter', a homeowner can do that on the display. Steps that say 'disconnect PV+/PV-/battery' are for the installer only.
What the engineer will check
- Measure battery voltage.
- Force-charge / battery activation per manual.
- Check BMS alarms and cell imbalance.
- Check DC breaker and polarity.
Who to ask for: Battery installer.
Certification: Electrician competent in electrical energy storage (BS 7671 Chapter 57; IET Code of Practice for Electrical Energy Storage Systems), ideally the MCS battery installer (MIS 3012); brand-approved installer to keep warranty.
What you might notice
Sources
- X1-Hybrid G3 User Manual (EN) ↗ · page PDF p.34-35 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026