During last hurricane in Louisiana my bilge pump stayed on along with a compressor cooler that supposed to stay on.. No sun, battery went dead for first time ever. No harm because BMS worked, BMS shut off .solar power coming in after this event stopped coming in i After all these years everything working well .i bypassed BMS with weak power supply basically bottom balancing one cell until BMS said all good. Pretty sure virtually no harm done.. BMS didn't allow power in from solar power.