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I'm still hoping for aerohead to stop by and explain "[the] electric cooperative's solar farm photovoltaic power option". I suspect it would make the ensuing discussion moot.
In terms of a 'roll-your-own' grid tie; I would think a properly engineered retro-fit would incorporate a DC-DC inverter and a battery storage bank in some configuration.
Start at the loose end, 5V USB, a 12V LED lighting system, maybe a 24V utility circuit (refrigerators); but definitely a buck/boost circuit so you can run OEM vehicle components like the heat pump for a new Leaf.
Then think carefully about a grid intertie and how the economics and politics will shake out down the road.
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