It depends on your power needs, the amount of water flow you can access, and the size of your generator. According to ABS Alaskan, the average American home without electric heat uses about 1000W consistently (less than the 1500 W put out by their Scott Hydro Turbine—meaning that device could power an average house). You can add up the wattage used by regularly running devices in your home—refrigerator, lights, washing machine, etc.—and compare them to the output of your generator.