We had a early cold snap one year. We would park the 8430 and the 9770 close together. We would run 2 extension cords and hook up a 7 hp generator. We would go have breakfast and when we came back they would pop off like summer. We would have to leave the generator in the garage, start it for a couple of minutes, load it up and wrap it in a old  comforter. If we left it in the pickup over night it didn't want to start.