What things do you want to run? If you want a/c you will have to go to something around 3500 watts. Maybe a little less but it depends on manufactures etc.
If you just want microwave and maybe a smaller hairdryer you may go 2000 watts.
If you want to stay out for say a week or so and just keep your battery up from using lights, water pump, ceiling vent you could go small and cheap.
If you are staying away from high draw items and dont want a big solar system, solar may do what you want.
If I was running my led tv or computer off it I would hesitate on the cheap one and get a Honda or Yamaha.
Dont go buy something from just what I said here. as you are doing, educate yourself
Others in here know A LOT and can help out.
They need to know what you are trying to accomplish.