Thanks. I get it now.
On Saturday, March 5, 2016 12:29 AM, Rick Brass via CnC-List
<cnc-list@cnc-list.com> wrote:
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answer to how the charger evaluates a bad battery was actually included in a
quote from the Pro Mariner manual contained in an earlier post. The software
in the charger measures the internal resistance of the battery to check for a
bad battery and reverse polarity. Too large a battery (too many AH) will show
high internal resistance. A pair of batteries in parallel will still show 12v,
but the internal resistance will appear to be lower than expected and might be
interpreted as a shorted cell. Rick BrassWashington, NC From: CnC-List
[mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Josh Muckley via CnC-List
Sent: Friday, March 04, 2016 6:51 PM
To: C&C List <cnc-list@cnc-list.com>
Cc: Josh Muckley <muckl...@gmail.com>
Subject: Re: Stus-List Soliciting Advice on 33-2 Battery Complement 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, MDOn Mar 4, 2016 5:06 PM, "Peter Fell via CnC-List"
<cnc-list@cnc-list.com> 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 Sent: Friday, March 04, 2016 10:29
AMTo: C&C List Cc: Josh Muckley 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"
<cnc-list@cnc-list.com> 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 <cnc-list@cnc-list.com>
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
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