Driving RV visiting around the world is a fashion  in the middle class.Electricity is the important thing in the course of the journey by RV.If the car doesn't have enough electricity,the engine doesn't start and you will miss lots of views,because you must charge in the RV camp.Now,most people pull panel up the top of RV,they can charge batteries during driving or long parking.It is convenient and practical.

       There are two types of panel glass panels and flexible panels.Which solar panel we should choose It depend on your budget.The flexible panel is more expensive than glass panel,while it's more efficient.When you choose flexible panel,you'b better  use MPPT controller.Because  it is also more efficient. Which even can raise 30% charging efficiency,and it is suitable for highter voltage.The highest voltage is 100V.