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The power grid has the potential to be insanely dangerous. We largely have eliminated that danger because of tight regulations and codes.

Look up backfeeding, which is a huge concern with this stuff. It is entirely possible for anyone sharing a transformer with you to send power back up the lines to your house in a dangerous way. That’s why you shouldn’t just plug a generator in with a suicide plug when the power’s out.

A grid tied battery without the right protections is electrically identical to a generator with a suicide plug. We want some standards here.