I'm thinking of getting a generator in case the power goes out - anyone here know alot about them? I'm trying to calculate how long it will power my return pump based on maximum wattage of the unit. I guess I'd spend a little more if I knew it would last longer. Or I guess I could just have more gasoline stored. If my pump is rated 110 watts, does that mean it uses that much per hour or what? I don't know too much about electricity.