It would be simpler to use a VFD, possibly in combination with a switchable displacement compressor for more dynamic range.
I'm actually looking at something like that for a thermal storage system, using a 2-4 ton switchable displacement compressor in combination with a VFD to try to match compressor power draw to surplus PV power available. That's pretty far out, however, as I will work on other parts of the solar power setup first.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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