This 12V/3000VA/120A/Multiplus has been great for the past two years and died trickle charging my two 100Ah, 12V, Battleborn LiFePo batteries. The inverter was in charger mode in my RV plugged into an extension cord from the house when I happened to notice while polling the BMV 700 that the battery SOC had dropped to 56%. There are no LEDs illuminated and the weather is cool. I have been able to charge the batteries with the Victron mppt 100/50 Smartsolar charge controller. There are no tripped breakers and the 400A fuse with the 4/0 3ft cables are fine.
The AC source seems fine @ 120V. The DC batteries are at 13.5VDC. A cursory examination finds all the ribbon connectors to be secure, no burned boards, nothing discolored as if it got hot. Everything seems nice and tight inside, no loose bus bars. The two 20A fuses on the charge board measure fine. There had been no load on the inverter for two months prior to the failure and it never sees more than a 900W microwave on the inverter side, that it handles easily. I have contacted my vendor in Flagstaff, and they had no idea. They are inquiring to Victron. I have scoured the internet and can't find an identical failure mode. Does anybody have any ideas? Thanks in advance for your input. ---- Scott