Yeah, my thinking has morphed into "build a DIY genset out of an old APU". I think that buying an old APU just for the 14 horse Yanmar in it, jury-rigging one or two large alternators onto it, and supersizing your inverter is the way to go for a roll-your-own genset. You've told me that minisplits are inherently soft-start, and run at under 1KVA in most cases. The specs on some of the pure sine 4-5 KW inverters say they tolerate a 300% overload for 20 seconds so running, say, and air compressor would not be a problem.
I'm willing to be shot down on this, but it sounds like it has real promise so far.
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