They included a couple of spare fuses
in the box with mine, so I presume they’re used serviceable. Do you have the programming cable? That might help with diagnostics. That said, the makers are pretty responsive to email
, so drop them a line.
I myself am running one as part of a fully integrated victron system. We leave out running at all times to keep the batteries
happy, as the bms fully controls all the charging
sources. (Also, our water
doesn’t turn hard in the winter
, and winter sailing is something that we definitely do).