I have found that load, as well as ambient temperature, can make a difference in the temperature the generator runs. While driving to Las Vegas (about 115 degrees) I was running 3 AC's with the generator temp running about 190. I turned on the 4th AC. After all 4 AC's ran for awhile the gen temp went up to about 200. I shut the 4th AC off and the gen temp came back down. With the four AC's and minor other loads, my ammeters were showing about 40-45 amps per leg or about 85 amps total. That would have been an 82% load on my 12.5 KW generator.
Cleaning out the radiator occasionally is a very good idea.
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