I came home the other day and as I'm pullling up to my mail box I hear a loud blowing sound. after a few seconds I realized my DC was on. I ran in and turned it off. and when I walked in I realize the power had gone off and it had been running for 5 hours. So I guess I made it through the break in period. From now on I guess I have to leave the breaker off if i'm not in the garage.