If you could find a used regenerative VFD (that supports putting power back into the AC input) for cheap, it would be reasonably easy to hack it into a grid tie inverter since that's what the regenerative function is. As a bonus, you can still use it as a VFD for air conditioning and stuff.
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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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