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 - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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