Installing a ground fault detection device (the AERL EarthGuard) which references PV +, PV- and Ground.
System is 250/100 MPPT, 3 Multi Plus II 3000/48 / 35-32s, Kilowatt Labs 3.55kWh modules x2.
It all works fine, but when I installed the Earth Guard, which was the last thing I did. It detected a fault between ground and negative. Which I've isolated to be coming from the MultiPlus II.
Is there functional negative grounding in the MPIIs? Is there an option to turn this off?
The AERL manufacturer said it could be a faulty unit.