ebay generator 800w for ww

Hello people bought me last week a power generator at ebay was really cheap 😉 I once thought if I want to do wild ́camping I also need 220V for tv+sat,and light and and…………..well now I have a question if I have a generator on the ww plug I have no problems everywhere in the ww current at tv+sat when I make light on light fluctuations( only light not on tv+sat) you can do something there or is that dangerous for devices or have your there ne idea how man can do it differently without spending a lot of money mfg maik