Getting a 'Warning 28' and the AC output to the house shuts off. Nothing much on but the lights .... is this W028: Inverter Overload ? This is a 12000XP fresh install with the indoor power wall. We had nothing running but LED lights, then even shut off power to the main panel and it was still kicking off with the Warning28 .... no way the inverter was overloaded. Suggestions? (note: power plant name Rick Noble under my account but I am not sure I got it online successfully)