Easy Peter, my response must have gotten stuck in the outbox. I actually wrote it prior to both your responses. I was not trying to contradict you. In fact I think you and I are kinda saying similar things. First, to Fred's point, two six volts in series will appear to any other system as a single 12v battery. It doesn't matter if the "system" is a current source or a current load. Second, to your point (AND what I stated earlier) golf cart batteries are significantly higher capacity in Amp-Hrs than a group 31. So, what I am saying (and I think Fred would agree) is that building a bank of batteries that equals 12v and does not exceed the AH of a group 31 (~125 AH), would charge just fine with the battery charger in question.
My hypothesis as to why you "can't" do anything larger than a single group 31 per channel is that a larger battery (2 6v golf carts in series, OR 2 12v in parallel) would be higher capacity (Amp-Hrs). The duration of time which would be required to achieve each state of charge would be significantly longer since the max charge current would be the limiting factor. The charger MAY use the measure of time (or the cumulative amps charged) to determine a bad battery. I can't see any other reason how the charger would ever be able to tell a difference. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Mar 4, 2016 5:06 PM, "Peter Fell via CnC-List" <[email protected]> wrote: > No. It won’t work. It will not charge two batteries in a bank either in > series or in parallel by spanning across the batteries. It will only work > with each leg of the charger attached to a single battery. That is very > specifically identified multiple times in the literature. > > 6V golf cart batteries are a no-go. Full stop. End of discussion. See my > previous posts. > > If someone at ProMariner or a retailer is giving you other info then they > are wrong. I admit that ProMariner support is a bit daft ... I’ve had to > re-ask questions several times to obtain answers to all the questions that > I asked. > > The Pro-Sports I think are decent chargers at a great price-point with > some rather unique features, like distributed charging ... but they have > their limitations. > > Peter Fell > Sidney, BC > Cygnet > C&C 27 MkIII > > *From:* Josh Muckley via CnC-List <[email protected]> > *Sent:* Friday, March 04, 2016 10:29 AM > *To:* C&C List <[email protected]> > *Cc:* Josh Muckley <[email protected]> > *Subject:* Re: Stus-List Soliciting Advice on 33-2 Battery Complement > > > 6v would be fine in series but from what I can tell from the > manufacturer's written and verbal guidance, the charger is limited to a > certain maximum battery size (group 31)... I assume Amp-hr limit. A group > 31 is about 105 AH. So if you are using two 6v @ 105 AH batteries then it > seems you would be fine. OTOH, I believe most golf cart batteries are > upwards of 200 AH. > > Some smart chargers have software that monitors the charge profile. If > the battery being charged deviates from the prescribed profile then it is > deemed bad. > > Josh Muckley > S/V Sea Hawk > 1989 C&C 37+ > Solomons, MD > On Mar 4, 2016 12:56 PM, "Frederick G Street via CnC-List" < > [email protected]> wrote: > >> Golf cart 6V batteries should still be okay, as long as they’re connected >> in series pairs to get the voltage up to 12V. >> >> Fred Street -- Minneapolis >> S/V Oceanis (1979 C&C Landfall 38) -- on the hard in Bayfield, WI :^( >> >> >> On Mar 4, 2016, at 11:50 AM, Peter Fell via CnC-List < >> [email protected]> wrote: >> >> I asked ProMariner for some clarification on the battery situation with 2 >> house connected in parallel as one bank and a separate start as a second >> bank. I also asked if there was any issue with using smaller than Group 24 >> batteries with the charger. For example, the OP has a Group 22NF. Another >> poster identified they were using a U1 AGM battery for a start (I’m >> assuming starting something small like an Atomic 4 .... and I’ve heard of >> that before). >> >> Answer from ProMariner tech support was that there is no issue with >> connecting the ProSport 20 Plus (3-leg) charger to this battery >> configuration provided you do 1 leg of the charger per battery and that >> there is no issue connecting to any battery that is smaller than the >> amp-hour size of a typical Group 31. >> >> So there you have it. >> >> If you want to go golf-cart 6V or 12V batteries larger than Group 31 or >> if you want to mix battery technology (i.e. flooded + gel or standard AGM + >> gel or standard AGM + premium AGM or ....) then look to another charger. >> Otherwise, fill your boots. >> >> Peter Fell >> Sidney, BC >> Cygnet >> C&C 27 MkIII >> >> >> >> _______________________________________________ >> >> Email address: >> [email protected] >> To change your list preferences, including unsubscribing -- go to the >> bottom of page at: >> http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com >> >> >> ------------------------------ > _______________________________________________ > > Email address: > [email protected] > To change your list preferences, including unsubscribing -- go to the > bottom of page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > > _______________________________________________ > > Email address: > [email protected] > To change your list preferences, including unsubscribing -- go to the > bottom of page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > >
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