2nd PCS2 failure

[mongo]

Also the PCS is apparently design to handle both DC and AC high power - which you would normally avoid as they complexity of AC or DC presents their own unique design challenges at PCS power levels.

It's a bidirectional DC-AC converter, no way to avoid it.

AC has an additional challenge in that the current flows in both directions. This can cause tremendous stress on components unless the circuit is design to protect against that.

The reported failures seem to be on the DC side MOSFETs, not the AC back to back pairs. The converter switching frequency is way higher than 60Hz, but likely uses ZVS/ ZCS internally.

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