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
From: Peter Fell
Sent: Tuesday, March 01, 2016 9:28 AM
To: cnc-list@cnc-list.com
Subject: Re: Stus-List Soliciting Advice on 33-2 Battery Complement
The 2 group 27 in parallel is covered in the manual but only as an example for
the 2-bank charger. All the 3-bank charger examples given are 24V applications.
I don’t think this is an issue.
6-volt golf cart batteries are not an option since the charger won’t do 6-volts
– only 12V Group 24, 27, 30 and 31 batteries.
By the way, I didn’t notice it originally, but the 3-bank ProSport 20 Plus
doesn’t have the ‘high performance’ AGM charging profile ... just ‘standard’
AGM.
Here’s a note in one of the manuals that mentions connecting multiple-batteries
in a bank:
Note: Incorrect wiring will result in reverse polarity or high reverse voltage,
in the event this happens, the ProSport Charger has been designed to not
fail as a result, however it will cause the charger to "internally disconnect"
and provide "no output" until the (reverse polarity) caused by putting the "Red"
+ lead on a - negative battery terminal) and/or the (high reverse DC voltage
caused by taking one bank cable and spreading it across two batteries) is
corrected ...
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