I have noticed that when the Charger Source Priority is set to Solar First, then the inverter takes very long to heat up from 31 to 40 degrees to start the fans again, sometimes about 6 hours, as to when set to Utility First the temperature of the inverter takes about 15 minutes to go to 40degrees and the fan starts again. Problem is that I have only one panel going so is does not help to keep the 24V battery properly charged while on Solar First with not much sunlight.
The noise of the fans do not bother me that much but at that rate will they last the lifetime of the machine?