For the second type of battery solution, you need to think about what your needs are first
. If you are thinking about complete RV solar solutions, then you need to get at least a sixty watt solar panel, just to start. You are going to have to get some high output deep cycle marine batteries, at least one for basic needs, if you plan to run things like a microwave oven, or media equipment, then two is recommended. For the best systems, you should at least 120 full watts of solar panels, with 2-4 hundred watt systems optimal. This means you will be able to not only charge up your batteries for night time use, but also all of your appliance needs on top of this.