Bob,
You are correct. It will shut itself down if it gets too hot, and it already has a built in buzzer. I have managed to make it go off a few times by charging the battery and then turning off the AC load. I assume the inverter was alarming due to battery overvoltage. Even if the overvoltage was only for a few milliseconds, it won't shut up until I power cycle the inverter.
Back to the heat issue... Heat kills electronics. The rule of thumb is that the service life is cut in half for every 10 degrees centigrade temperature rise. Even if it doesn't overheat enough to turn itself off, running hot isn't good for it. My baffle seems to be working, though I don't have hard data to prove it.
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