BMS_TemLow on a SolaX Power battery: Low temperature of BMS. Solution: Warm up BMS and restart; contact after-sales
Short answer
On a SolaX Power battery, BMS_TemLow means: Low temperature of BMS. Solution: Warm up BMS and restart; contact after-sales. The battery stops until the fault clears or is reset. The wording differs by model range — each is shown below.
Reviewed 24 September 2026 · 2 sources
What it means
On the Triple Power T Bat Hv S
The manual says: Low temperature of BMS. Solution: Warm up BMS and restart; contact after-sales.
Part involved: T-BAT SYS-HV BMS.
On the SolaX X1-Hybrid G3
The manual says: Battery Fault - under-temperature fault.
Part involved: Battery voltage / state of charge.
Likely causes:
- As described in manual.
Is it safe?
On the Triple Power T Bat Hv S
| Does the battery stop? | Yes |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
The battery stops until the fault clears or is reset.
Resetting itself: after temperature normalises and restart.
Manual reset: Restart BMS (installer-guided).
On the SolaX X1-Hybrid G3
| 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
On the Triple Power T Bat Hv S
- Read and note the exact code or light pattern and the time (photo or app screenshot).
- Look (without opening anything) that nothing is blocking the unit's vents, it is not in direct sun and the space around it is not unusually hot or cold.
- Wait for the battery to return to normal temperature - it can then restart.
- Check the battery/inverter AC isolator and the consumer-unit breaker are ON. Do not keep resetting a breaker that trips again straight away.
- Never open the battery, inverter or gateway casing and never touch DC cables, connectors or battery terminals.
- If the code stays or keeps coming back, contact your installer (quote the code) - do not keep power-cycling.
On the SolaX X1-Hybrid G3
- 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
On the Triple Power T Bat Hv S
- Restart BMS via POWER button/switch sequence; check BMS-inverter CAN cable and series box; check module firmware/type match; contact SolaX after-sales.
Who to ask for: battery storage installer.
Certification: SolaX-trained installer ('skilled worker' per manual); MCS battery certification.
On the SolaX X1-Hybrid G3
- 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
- T-BAT-SYS-HV-S25 / T-BAT-SYS-HV-S36 User Manual, Version 16.0 ↗ · 16.0 · page 47-49 · Reviewed 24 September 2026
- 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