Thanks for all the info. I've purchased a sump pump battery backup that should keep my 110 watt pump going for almost four hours. I can purchase an additional battery pack that plugs into the backup unit and would extend the pump run-time to about 8 hours. I will use the old computer backup battery for my aerators. It only kept my pump running about 15 minutes or so. I might also buy a couple of those Penn Plax B11 battery operated aerators for really long outages.