I have the gel batteries installed under the settee in the main cabin on my
boat and this is an original design. This, of course, does not mean that they
are ABYC compliant.
Marek
From: Robert Boyer via CnC-List
Sent: Thursday, November 19, 2015 3:07 PM
To: cnc-list@cnc-list.com
Cc: Robert Boyer
Subject: Re: Stus-List Changing weight distribution in Landfall 38
I think ABYC is a little to conservative on this issue if that is their stance.
"AGM's are advantageous anyplace where you need a reliable totally sealed
battery for safety or environmental reasons - wheelchairs, medical standby
power, inside RV's, computer room UPS systems, or in enclosed
spaces in boats."
Bob
Bob Boyer
S/V Rainy Days / Annapolis MD
1983 C&C Landfall 38 - Hull #230
email: dainyr...@icloud.com
blog: dainyrays.blogspot.com
"There is nothing--absolutely nothing--half so much worth doing as simply
messing about in boats." --Kenneth Grahame
On Nov 19, 2015, at 1:19 PM, ed vanderkruk via CnC-List <cnc-list@cnc-list.com>
wrote:
Technically vapors are an issue. All battery types - wet/sealed/gel/AGM - are
subject to ABYC venting guidelines. There are some solutions - venting the
battery enclosure or having vented caps for wet cell directed overboard
somehow.
Ed
On Nov 19, 2015 12:50 PM, "Robert Boyer via CnC-List" <cnc-list@cnc-list.com>
wrote:
I DO use AGMs--so, vapors are not an issue. I have some space just forward
of the mast under the settee but close to the boat's centerline that might work
for battery storage--I have to check out the dimensions but this would remove
weight aft and add it close to the center of gravity.
Bob
Bob Boyer
S/V Rainy Days / Annapolis MD
1983 C&C Landfall 38 - Hull #230
email: dainyr...@icloud.com
blog: dainyrays.blogspot.com
"There is nothing--absolutely nothing--half so much worth doing as simply
messing about in boats." --Kenneth Grahame
On Nov 19, 2015, at 11:54 AM, Marek Dziedzic via CnC-List
<cnc-list@cnc-list.com> wrote:
Bob,
as you said, the current from the house batteries should never be high,
so the wires should not be an issue. However, if you calculate your load at 30
A and select appropriate gauge of the wire (for distance), make sure that you
install an appropriate fuse (probably not larger than 50 A) (I would do it
right on the terminal, but ABYC says, within 6 or 7 in from the terminal) to
protect that wire. Such fuse would probably allow for one quick start of the
motor (it would not allow for cranking a cranky motor). But if you want to be
able to use your house batteries for cranking, you have to allow for at least
80 – 100 A in that cable (i.e. appropriate gauge). Keep in mind that if you
install bigger cable, your voltage loss would be less, so you would have more
energy available to you lights and instruments (instead of heating the cabin).
One other thought. I am not sure if putting batteries under the V-berth
is the best idea. As much as you could, you should avoid placing heavy objects
far away from the centre of gravity. In heavy weather the heavy bow would be
your enemy, not a friend.
And finally, at least theoretically, you should not install the normal
lead-acid batteries in the cabin (where they are not vented directly outside).
If you want to install batteries below, you should use the gel or AGM
batteries. This, in turn, leads to a more complex charging system (especially,
if you are going to use AGMs).
just a few ideas to consider
Marek
1994 C270, “Legato”
Ottawa, ON
From: Robert Boyer via CnC-List
Sent: Thursday, November 19, 2015 11:24 AM
To: cnc-list@cnc-list.com
Cc: Robert Boyer
Subject: Stus-List Changing weight distribution in Landfall 38
I am equipping my boat for 8 months per year of cruising in the Bahamas.
I have added a 19-gallon auxiliary diesel tank where my holding tank was
located (under the navigation seat) which adds weight aft. I currently have 4
group 27 batteries which will be eventually upgraded to Group 31's--these also
are located aft.
I have been considering moving 2 or 3 batteries from the aft cockpit
locker to some dead space under the v-berth. This would take some weight from
the aft and add it forward. (My boat currently sits about 2" high at the bow
and maybe 1 inch low at the stern with no one aboard but full fuel tanks.)
I could configure the batteries such that the new forward bank could be
the house bank and the starting bank (which I could probably reduce to 1 or 2
batteries) could remain aft. My problem is sizing the cables that would run
from the forward batteries to the aft controls. As I see it, these cables
would never carry more than 30 amps (maximum charging from my solar panels)
unless I needed them for starting (in the event of a dead starting battery).
Does anyone have any comments or suggestions on this matter?
Bob
Bob Boyer
S/V Rainy Days / Annapolis MD
1983 C&C Landfall 38 - Hull #230
email: dainyr...@icloud.com
blog: dainyrays.blogspot.com
"There is nothing--absolutely nothing--half so much worth doing as simply
messing about in boats." --Kenneth Grahame
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