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I thought for a long time about how to charge an additional battery in a motorhome while driving. At first I thought about putting a solar panel on the roof, but eventually abandoned this idea. Firstly, in bad weather the panels are not as useful as I would like. Secondly, in winter the sun is too low from the zenith, and the efficiency of the panels is also very low. Thus, I came to charge the battery using the standard generator of the car. But it is not safe at all to send current to the battery directly, and the DC/DC charger Orion Tr Smart can solve this problem