John Crabtree 5 When it first arrived, I turned it on and it cooled to the temperature fast. I moved it to my camper and it wouldn't turn back on. I was disappointed. After letting it set plugged in for about 15 hours it turned on and has been great since then. Cools fast and only uses a small amount of power. Plugged it in to my Eneour 300 watt power source DC, and it ran perfectly for about 18 hours. Worth the money.