Hi Solar! Sorry to hear your 8010 inverter failed. If two items failed at same time i doubt its a coincidence. Not impossible but seems unlikely. Charge controllers are rarely isolated. Maybe i could say never but then id be wrong somewhere.
The things i know of that will destroy them.
1) what noneya said.
2) toroid and choke improper tuning (75 or 90 hz ideal) 1.5 times run freq, avoiding resonance.
3) too much power. My 5500W board was running 5kw today intermittently but it did not do 7500. Thats just plain foolish, not the inverters fault
of course properly functioning and properly set overload should mitigate this but the overall design of the application should prevent this from ever being needed.
4) direct connect output to mains, thatll getr every time. Ive never had issue once i went to 80A dpdt long throw contactor.
5) create a high frequency arc on the DC supply. Via bad connection or otherwise.
Ive only had failures with reason 4 and 3 others may be able to add to this list.
All the best dont give up! Solar equipment can run as reliable as an old refrigerator, i must admit a turbine adds a twist, kinda like a wildcat with your tame ones
Lighthunter