Even with 50 amps charge rate, I got the over temperature warning and fault. While in Bend at Richard Boatman's facility, I presented the problem. I think his technician quickly located the source of the problem. Beaver mounted an air filter behind the ProSine to filter the air going to the fans that cool the unit. When he removed the filter, he could hear a change in the fan noise. The filter was dirty from 9 years doing its job. He replaced the filter and we have not yet been bothered by the fault alarm. He said the filter is not a ProSine part, but added by Beaver on the assembly line. Without the filter, they needed to remove the ProSine periodically and blow the dirt out the circuit boards and fan housing. So if you have this fault problem, look for the hidden filter or clean the unit.
Larry