When your units have died, have they showed any response from the envoy? Mine is showing 1-2W during the day, and blanks out at night as if it still recognizes the sunrise/sunset and panel inputs. The webpage still lists it as "normal".
I guess this weekend I'll take a meter up on the roof and see whether I cooked a blocking diode in the panel or a microinverter. At first, I was thinking panels are pretty fool proof, but then I remembered the blocking diodes in them.
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