Quattrohead
Solar Wizard
I would now bypass each panel in tern and see if a single panel is causing this, due to a possible leak from damage.I switched the PV wires to another inverter (I have 4 in parallel ) that is working fine, and suddenly got the code 19 result again. So something about this one PV string is making whatever inverter it is attached to trigger a code 19. With the wires disconnected from the inverter, but hot, a volt meter set to DC reads 302v, I did check +/- and they are not reversed.
Also are each group of panels grounded to each other and check those grounds again.