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 ...
From: Doug Welch via CnC-List
Sent: Tuesday, March 01, 2016 8:01 AM
To: cnc-list@cnc-list.com
Cc: doug.we...@rogers.com
Subject: Re: Stus-List Soliciting Advice on 33-2 Battery Complement
Thanks for the heads up on the one battery per set of charging leads. I am more
of a search the manual for what I need than a read it cover to cover guy. 2
common configurations (at least in my experience) are
1. 2 group 27s in parallel on house bank and 1 group 24 on starter bank
2. 2 6v golf cart batteries in series on house bank and 1 group 24 on starter
bank
Neither of these are covered in the manual.
I will write promar support and see what they say.
Thanks again.
Cheers,
Doug
On Sunday, February 28, 2016 9:46 PM, Josh Muckley via CnC-List
<cnc-list@cnc-list.com> wrote:
I checked the owners manual and it repeatedly states that only 1 battery per
channel shall be connected. I am just guessing but it might be part of the
over current/battery safety algorithm. More than one battery in a bank and now
the max current draw goes up, the time till full charge goes down and the bank
resistance should also drop considerably. The unit will probably detect the
"abnormal" conditions and then shutdown and display a battery fault.
Josh
On Feb 28, 2016 6:18 PM, "Doug Welch via CnC-List" <cnc-list@cnc-list.com>
wrote:
Thanks. What is the problem with the pro sport charging 2 batteries on a
single bank? I always try to keep identical batteries of the same age on the
house bank. I know there is a phenomenon where 2 batteries on the same bank
will only charge until the first battery is fully charged, but usually keeping
the batteries of the same age and model will minimize this.
On Sunday, February 28, 2016 3:36 PM, Peter Fell via CnC-List
<cnc-list@cnc-list.com> wrote:
As you are looking at batteries keep in mind the ProSport chargers will only
work with Group 24, 27, 30 and 31 batteries. And if you start looking at AGM
batteries,while the standard AGM and flooded battery charging profiles are the
same, ‘premium’ AGMs can’t be mixed with ‘standard’ AGMs or flooded. Charging
profiles can’t vary between banks with the Pro-Sport.
Another oddity .... if you have a 2-bank Pro-Sport then max. of 2 batteries
total (1 house, 1 start). If you have a 3-bank Pro-Sport then max. of 3
batteries (2 house, 1 start). In other words, each battery must be connected by
a leg of the charger.
Finally if you have a battery combiner, disable it when you are on shorepower
(many, such as the Blue Sea, can be turned off via a switch or relay mounted in
the ground wire ... but many can’t be disabled!). Disabling the combiner is a
best practice due to the distributed charging scheme programmed into the
Pro-Sport.
Peter Fell
Sidney, BC
Cygnet
C&C 27 MkIII
From: Doug Welch via CnC-List
Sent: Sunday, February 28, 2016 10:18 AM
To: cnc-list@cnc-list.com
Cc: doug.we...@rogers.com
Subject: Re: Stus-List Soliciting Advice on 33-2 Battery Complement
ok thanks all. another question. is it possible to start the 20GMF with a
handle? I think i will get the surettes load tested and decide whether or not
to replace after that and replace the starter battery with a group 24 (if it
fits). We are also hoping to do more cruising and spending time on the hook, so
we are looking at get set up with solar as well.
On Sunday, February 28, 2016 9:41 AM, ed vanderkruk via CnC-List
<cnc-list@cnc-list.com> wrote:
We have two T12 136ah ( slightly larger and heavier than a group 27 ) Rolls
house batteries which are now in their 12th year of service. I was thinking
they were near their end of life but a battery equalization last year seems to
have given them a new lease on life. We replaced a Rolls starting battery after
11 years.
Ed
1982 LF38
On Feb 27, 2016 1:20 PM, "Doug Welch via CnC-List" <cnc-list@cnc-list.com>
wrote:
Our new (to us) 33-2 has a couple of Surette Group 27 Deep Cycle Batteries
of indeterminate age in plastic battery boxes with no lid and a Canadian Tire
22NF starting Battery (In what looks like a home made wooden battery box).
My first instinct is to replace the deep cycles with Interstates and
upgrade the 22NF to a Group 25 Marine Starter Battery in proper battery boxes
(I have seen first hand how quickly a dropped wrench landing on exposed 12v
battery terminals can go very bad).
The charger is a relatively new looking Professional Mariner ProSport 20
Heavy-Duty Marine Battery Charger. Both banks are monitored by a cruising
equipment company e-meter.
My questions are
1. Does anyone have 2 G27s and a G25? Is there room?
2. Someone told me the Surette are very good batteries with longer than
average life and I shouldn't be in a hurry to replace them. Experience ?
Thoughts?
3. Anything else from your experience I should be thinking about?
Cheers,
Doug
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