Maybe somebody can help me with the following question on batteries: I have several batteries which I have to charge from different sources. I have solar panels on the roof of my RV, 2 by 3 meters. On a sunny day, they can charge maybe the equivalent of a 100 ah battery. But if I run appliances during the day, or it's cloudy, the charge from the solar panels does not carry me through the night. So I bring reserve electricity with me in the form of several batteries that I fully charged at home. I understand that it's unwise to combine different batteries in a bank because of different charging parameters. But I wonder whether different batteries of the same voltage could be used in a parallel circuit for discharge cycles only? What I would do is this: disconnect the solar controller in the evening, then do a parallel circuit of the half charged battery usually connected to the solar panels, plus 2 batteries at different charge levels remaining from charging at home. Then I would have enough electricity through the night, and an additional rationale would be that none of the batteries get fully discharged.