True fan only runs at some set temp and above. But it is in enclosed compartment so all heat the inverter generates stays in the compartment causing fan to fun more. High probability that fan will fail before any electronic component and then inverter design will matter. Hopefully there is a fan monitoring circuit and it will shut the system down with a fan fail code. I spent a good part of my life in computer repair and fan failure was most often cause of other more serious failures. So should you leave inverter on when not being used - NO. Shutting it off during periods of storage will improve odds of not having a failure.
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