You will need to make a judgement of purchase price, economy in use, power output, noise output and voltage/ frequency stability Rhea. You can get some very cheap, but crude and noisy generators. At the top end are the Honda EU range which are expensive but very economical, very quiet and output stable. The EU2.0i's that we bought were well over £1000 each. They have a maximum output of 1.8 Kw, which means the freezer and fridge is OK but the kettle isn't, so out comes the camping stove.