Yeah, it really seems like a better application of a 'micro-grid' would be to provide alternative green electricity to your neighbors.

Like okay, you have a bunch of solar panels and a battery bank. Why not let people plug in at a kiosk near the bank? At a micro scale, your neighbors could hook up a heavy-duty appliance cable or two to their houses. You could use RFID cards, magstrip cards, username/password, a web frontend, an app, etc for identification, metering, and billing.

Sure you could accept cryptocurrency for account credits, but you could also accept cash or credit/debit. It's just another payment processor.