For those that are FMCA members or others that may be interested the current Family RVing magazine has part 1 of a 12 VDC Primer. This part covers topics such as RV battery systems, the composition of a battery, battery discharge, battery charging cycles, and battery load testing. It is a good read if you have access to the magazine in hard copy or on line. Since the article is only available to members it distributed in the forum. For FMCA members, here is the link to the article
https://familyrvingmag.com/2020/03/0...primer-part-1/
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