What do SolaX Triple Power 'BMS_...' errors mean?
Short answer
They are battery faults that the SolaX inverter displays. SolaX's T-BAT-SYS-HV-S25/S36 manual (version 16) lists 29 messages, such as BMS_TemHigh and BMS_CellImbalance, and says the inverter stops as soon as a warning is reported. For most codes the first step is 'Restart BMS', which your installer should guide. Temperature faults clear once the battery warms or cools.
Last checked 24 September 2026 · 1 source
What does this mean?
On the battery, a fault shows as a solid red status light for 10 minutes, then a slow red flash. A yellow flash means a warning. The four charge-level lights show 10 fault groups (voltage, temperature, current, hardware, relay, insulation, self-test and communications). BMS_Insulation_Fault, BMS_Relay_Fault and BMS_Precharge_Fault point to wiring or hardware problems. Do not keep resetting them.
What should I do first?
Record the code and current battery state before changing settings. Follow only the owner-safe reset steps in the manual.
When do I need an engineer?
Use an installer or manufacturer support route if the fault returns, involves isolation or protection, or the manual does not give an owner reset.
What to do next
If the system is hot, smoking, damaged or making unusual electrical noises, move away from it and follow the manufacturer emergency guidance.
Sources
Last checked: 24 September 2026