Units installed March 2020. Worked perfectly for 4 months. Both units now fail (inverters trip) when the mains (AC input) fail. Have isloated the units outputs - not connected to any load. Definately not load related. Used Quick Cionnect to reconfigure as parallel pair. No error codes which can be related to Quick Connect log. I find it strange that both units fail simultaneously - I will appreciate any information to get these units operate again.