We found the fan would cycle on and off floating 2 group 31 AGMS at 85F ambients, and blow out a good amount of heat.
I was surprised as the output amperage was only ~0.5 amps to float these 2 agms. The fan is loud so adding another, switched was desirable to him.
We will be relocating the POt and Voltmeter and have the unit located somewhere not so accessible for pot twiddling.
It looked as if the thermistor had been removed and replaced with a giant black honking thing about 1.5 inches across. The white immobilization caulk had obviously been scraped off.