I was without power for over 40 hours. I used a power inverter running off the auxiliary plug in my truck. Ran two 6045 for an hour on and an hour off. Thus far have not loss a coral or fish. Now we'll see when I get home later today. Sadly the prop on my 6105 broke just before the storm hit or otherwise I would have run the 6105 off battery. I, too, will be better prepared.