Greetings all, I installed two 12000xp's six months ago. Not parallel, but with interlocks on each load panel so that either inverter can power both load centers. I have three 4400W strings of PV. Inverter-1 has halted with "warning 20" multiple times. Tech support said "check your PV grounding". No problems found there. Warning 20 clears when I turn off the PV breaker. Turn back on everything's fine. Only pattern I see is that it has only happened during daylight hours. Load has been typical. I switched the PV strings and upstream breakers between Inverter-1 and Inverter-2 after the last Warning 20 event.There's a 4800 W water heater that may or may not have been running, but that's the main draw on that inverter. Yesterday morning about 10:am it tripped again. This time display switched between Warning 20 (pv grounding) and Warning 28 (overdraw). I think the machine needs service or replacement but what do you think?
