I'm a retired IS director, so have some knowledge of circuits etc. too. I doubt there is a fan sensor, but I would bet there is a thermal protect circuit that will shut the invertor off should it overheat. Mine too is in a compartment, but even in warm weather the fan probably does not run more then between 50 to 60% of the time. Its nothing I am going to spend any time worrying about, mine stay on all the time, which is the way its most convenient for me to run it. If it fails I will deal with it, until then I wil use it.
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