Heat sink design problem
It looks like the blades on top of the heat sink are too short and too close together.
And those on the sides should have been a bit longer.
If that big boy sink you added on the bottom is taking a lot of heat,
that would be the perfect place to add some well aimed air flow.
That bottom sink might be all you need, if the bottom floor of the
inverter is thick aluminum and the power transistors are mounted on that floor..
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