Yo Professor, Ive owned and in RV 12 volt applications for 40 to 50 years Ive always used (well of course) and charged them in series with a 12 Volt charger. OBVIOUSLY the charging current that passes through both batteries is the same amount of amps WELL DUH LOL we all know that. As I noted anytime multiple batteries are used regardless if in series or parallel they should be the same type and brand and even age for best charging and use balance and to avoid a weaker one sucking down a stronger one.
I can see possible advantages or disadvantages of series versus parallel charging and monitoring cells with a hydrometer etc., but for Rv use when I install BOTH new batteries at the same time and monitor their INDIVIDUAL condition now n then (Voltage and Load testing as well as Hydrometer) Im sticking with series charging using a quality Smart 3/4 Stage charge and NOT configure and charge each 6 volt individually HOWEVER now that I upgraded to single 12 Volt AGM batteries I no longer have that concern yayyyyyyyyyyyyy
Thats my story, my opinion and experience of 40 to 50 years of RV use AND IM STICKIN TO IT LOL
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Today's Featured Article - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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