The strength of a generator varies. If you have one with lower wattage you can run the basic things like lights and fans at home with it. If you have one with higher wattage, probably around 5000 watts, then you can run a desk computer, a television, geysers and so on. If you want to make a sensible buy, find out what you wish to power. Make a detailed analysis of your needs and also of the products available in the market. Match them both and find the one that will suit you perfectly. Finally, don't depend on surge wattage which is only what the power portable generator gives in the beginning and goes down later.