Because of how gens make power, basically a motor in reverse. So giving it more power than it is producing is going to fry things. THOUGH it depends on your gen. Some sense the power and shut it off. But either way you don't want to run your tractor with your solar panels. (Another project entirely I'm sure. lol)
You need a buffer, like batteries. With batteries you can feed the grid with solar, and use it during an outage. If they can't keep up then plug in the gen and charge them back up. Tesla has some awesome batteries that last a long long time and are very efficient.
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