You have a water cooled inverter? Does it use engine coolant, or is there a seperate, lower-temperature circuit?
Honda uses air cooled inverters with an enormous heatsink (54 fins, 30cm * 5cm) and a large blower. The housing gets a bit warm when I'm operating in charge depleting mode, but I've never heard the blower kick on.
Btw, I've never heard of a Honda DC/DC or inverter failing.
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