It surprises me how few "experts" understand how the Trace 4K units work given how prolific they were in this industry. I've followed behind paid service contractors to find fairly common issues. Be careful who you take advise from and give your money too.

As much as I think Victron makes a replacement for the Trace unit I suspect they are too complex for many.

I'm perplexed. Did this coach actually have to single feed inverters installed without a transfer switch??? How could that work?