Hi Doug - went through this think myself, I had the std 33-2 setup of 2 group
31 (I think... Could be 34). Deep cycle flooded batteries (batt 1 and 2) and
an added xantrex smart charger.
Got some advice from a backup power designer....
Will parallel the existing batteries and add a u1 start battery, switched with
a blue seas selector/ combiner, (in a panel with 24/7 breakers and no more
kick-off toggle) an vsr, all monitored by Victron energy bmv-70, which fits the
stock 2" hole. Decided against a smart regulator as offering little benefit.
Fitting that 3rd battery is a trick, would live to know how it was fine in
yours.
Dave
The stock alternator is fine
n 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
Sent from my iPhone
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