2, 6 volts or 2, 12 volts

Ready2gonow wrote:
I have 2, 4 year old 12 volt marine batteries in my 5th wheel. I use no inverter, and have the factory Intelli- charger converter charger. I believe 9920 series. I usually am hooked to shore power, have a 2k generator, no solar. I plan on more boondocking this summer. I checked voltage this am at 12.8v. Unplugged from power, left a few led light s and frig on propane for 6 hrs. Rechecked voltage and it was 12.4, and slides and lights were working fine. Rehooked to 50 amp power and batteries read 13.7 v

Are my batteries still sufficient? If not, will 2, 6 volts be more efficient than my 2 12 volts of about 200 amphrs? Guys at Interstate battery told me 6 volts are longer to charge. Is that correct? Will my charge wizard fully charge 6 volt batteries? I have read on this forum that a higher voltage is needed to fully charge 6 volts. Most advice is appreciated.

If your batteries are dropping to 12.4 with such a small load then they are defiantly getting tired.(this assumes that "a few led lights" are a couple and not a large rv that's all lit up).

Your converter isn't large enough to matter as far how fast 6 or 12 volt batteries will charge. If you don't have the wizard for your converter get one so you can choose a better voltage when gen charging. The bigger issue with 6 volt batteries is that you can pull them down further and they recover better. But there is a cost, the water level needs to be looked at more often. If you boondock for a week or so then plug it in to recover then charging voltage is not as big of an issue.
See how we assume how you use your RV.