We have a generator for the house and I can't tell you how many times it has saved my freshwater tanks. My saltwater tank is still fairly new and it has already been a help because the summer storms knock the power out all the time. It gives me peace of mind, especially when I am working or just not home. Its nice having one that can power the whole house, but if I didn't have that, I would for sure have a small one that would kick on if the power was out to keep the tanks going.