I've just received PTO from my utility, APS, and after charging my 2 Powerwalls to 100% I've been trying an experiment. I turned off the main circuit breaker in my breaker box and have been operating as an energy island for 3 days now, using only my solar panels and powerwalls to power my house. I don't have an electric vehicle. The only curiosity that I've noticed so far is that the digital clocks in my house (including the clock in my stove and my microwave oven) have been losing time ... about 5 minutes in a 24 hour period. Anyway, I was wondering if I need to do anything other that turn the main circuit breaker back on when I'm done with my experiment. Any Comments?