Post #9357

I wired up 6 strings of panels to a PV busbar and then connected two MPPT chargers to that bus bar. Today, one of those units malfuctioned and let some magic smoke out. No worries, its a warranty claim. The issue is that since it was connected to the same solar panels as teh other unit, the other unit saw some shenanigans with the voltage from teh PV positve to the battery postive and decided it should "crowbar" the solar panels. So two different failures cascaded. I should NOT have connected two MPPT units to ONE set of solar panels. Lesson learned is each MPPT gets it's own set of dedicated solar panels. Ordinarily you can reset the crowbar in software but it didn't work this time. So two units down and two RMAs.