very long? The light goes dim after awhile. What can we do to find out why the lights go out so fast. Is there a tester to check the battery or should we get gel battery as the gel battery I was told last a lot longer? I was also told to get another solar panel. What wattage size should we use? Is there any other way to use the tv or microwave besides the inside generator? Most State beach do not allow you to turn on the generator until 10:00am and turned off by 8:00pm?

Thanks again for your answers.

I would say your coach batteries are not connected to the charging system on the engine. A new battery has over 12 volts when charged and with the engine running it should show over 13 volts and your coach batteries should be charging with the engine running. If you have a volt meter check it or have some one check it for you. You also need to have the battery for starting the engine isolated from the coach batteries because if the engine is off with all 3 hooked to the charging system they all 3 will go dead. An RV shop knows how to hook them up so they will charge all 3 and also keep your engine battery alive.