I have a 2014 Volvo 780 with a factory installed Xantrec HF Inverter. The first 4 years this worked very well, but the past two years the inverter keeps giving Error Code 5 or 3 when below 60 degrees ambient temperature. I can keep a 12 volt heater going during cooler temps and this sometimes keeps the inverter working, but when I turn the engine off the inverter drops to 12.3 volts within minutes and then shuts down soon after. I usually only run a toaster, coffee maker and microwave in the morning or evening, but do not leave anything plugged in. I sometimes keep my laptop plugged in during a 34 restart, but this draws very little voltage.
I have talked with Volvo mechanics about the issue and they have no clue. I have talked with Xantrec and they recommend a newer model that can withstand colder temperatures. Yet no one can tell me why this thing shuts down in only cool weather. So I put this out there: Has anyone else on this forum experienced similar issues and if so, what did you do to correct the problem?