We have 2 Trojan 6 volt golf cart batteries and when we were in Quartzite this winter for the circling of the Montanas it was 21 the first two or three nights, we have all LED lights in the rig now and the furnace ran for most of the night. The first morning we still had 3 out of the four battery charge lights lit. The furnace draws a fair amount of juice so the 2 6s are working out great. We would like to eventually get 4 or 6 but for now the 2 are doing us great. Our OEM 12 volt would have not made it through the first night..
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