FWIW, AGM is lead acid also...
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----- Reply message -----
From: "Carter Quillen" <twowheelinguy@yahoo.com>
To: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
Subject: [Electric Boats] sailboat house battery bank questions
Date: Sat, Apr 7, 2012 5:44 pm
William,
I agree with everything capt. Mike said except for one thing. I too have had a belly full of lead acid batteries and am saving my shecles to upgrade to AGMs as soon as I can. I agree with your decision on that subject. It should be worth the extra cost.
But I'd go with the 6Vs in series rather than the 12V in parallel if you need the exta storage capacity. Every electron thru every cell every time. Avoid parallel batteries whenever practicable. It's better system architecture to be is series whenever you can.
Even with a good bms, there are more potential problems with batteries in parallel than there is with a few extra connection points. But that's just my opinion and no warrantee is expressed or implied.
Carter
________________________________
From: william munger <wmunger@programmer.net>
To: electricboats@yahoogroups.com
Sent: Saturday, April 7, 2012 2:41 PM
Subject: Re: [Electric Boats] sailboat house battery bank questions
Thanks for the input. Yes DualPro says it is fine to use more then
one charger output into one battery, so it could act as a 40amp
charger for a single battery or 2 20amp chargers for 2 batteries. I
had purchased the DualPro a couple years ago based on what I read in
this group.
I think I have decided to go this route:
Deka 4D AGM (8A4DLTP) batteries (129lbs, 12V, c/20=198, $400 each) X
4 for c/20=792, 516lbs, $1600
According to a battery calculator that uses
Peukerts, that would last me at least 1 day of none stop 20amp
drain.
The
Engel SR70 Built-in Refrigerator I am looking at says it draws
0.5 - 2.7Amps
I plan to to use LED lights everywhere I can and the navigation
stuff should not take too much.
I want to be able to use a microwave (dc or ac with inverter) which
is a big draw but only for 10 mins or so.
Computers will be a big drain also but not sure how much I would
actually use them when away from a dock.
My next question is about battery management/monitoring systems.
I am looking at the Blue Seas VSM 422. It monitors AC, DC, Tanks,
and Bilge all in one. The issue I have is it can only monitor two
batteries. Is it reasonable to monitor just 2 of the 4 batteries to
get an idea of what all 4 are doing? Do you guys have any
suggestions on maybe looking at another system to monitor 4 - 12
volt batteries for temp, amp-hr remaining, volts, current amp draw
etc? I have seen the pak-tracker mentioned a few times, is that a
charging/management system or just a monitoring system?
William
links:
http://www.civicsolar.com/node/19313
>William:
>
>At lot of people use 6 volt in series and parallel configurations. But, I never like the idea because of the additional connections required which makes for more potential failure points. But, that's just my personal feelings on it.
>
> As far as battery choice my life has gotten easier since I started using AGM and Gels on board. No longer have to carry or find distilled water when on a cruise for the batteries. No more acid burned holes in my clothes either. AGMs are a little more expensive but, they allow for more boat time and less maintanence. I like that. If you go with flooded lead acid you will need to install them in a sealed battery box too.
>
>The Dual Pro charger is a nice unit. But, since it is four smart chargers I don't know about paralleling two outputs. You might want to check with the Dual Pro people just to make sure there is no interaction with the charging electronics. But, if they say it's ok I'd stick with the Dual Pro and 12 volt batteries just to make things easier. Anyway that's my two cents.
>
>
>Capt. Mike
>http://biankablog.blogspot.com
>
>
>From: william <wmunger@programmer.net>
>To: electricboats@yahoogroups.com
>Sent: Friday, April 6, 2012 5:21 PM
>Subject: [Electric Boats] sailboat house battery bank questions
>
>
>
>Hello all,
>
>I am in the research stage of a complete dc /
ac rewire of my 1978 33' hunter.
>
>On the subject of House battery bank my
thoughts are this
>
>Plan A:
>using 4 6volt batteries to wire up as 2 12volt
banks.
>
>Looking at either:
>Deka 8AGC2 AGM, 6volt, 200AHr, C/100 220AHr,
68lbs, $225each
>or
>Trogen T-105 lead acid, 6volt, 225AHr, 62lbs,
$140each
>
>I think I would rather have AGM because of
these being located under a berth, am I being
too cautious on hydrogen gas and spillage? The
Price difference is large but I think it may
be worth not having to deal with venting and
spillage concerns.
>
>I plan to have 12V lights, navigation, radios,
computers, lcd/tv, pressure water pump, black
water pump, refrigerator, microwave, and maybe
AC. (I know 12v AC sounds pie in the sky)
>
>One of my issues is this, I have a DualPro 4
bank charger (4x15amp). As far as I can tell I
can not use 1 charger bank for each battery
because the charger is designed for 12V
batteries. I think I can use 2 legs of the
charger to charge 2 6V batteries that are
wired up to be 12volts. Am I correct in this
or would it be better to sell the DualPro and
get 4 chargers designed for 6 volt batteries?
>
>Plan B:
>using 2 big 12volt batteries such as:
>Deka 8D AGM 12volt, 245AHr, 158lbs, $400each
>Then I could use my current DualPro set up
with 2 legs going to each battery giving
30amps of charging to each 8D.
>
>Plan B may be headache but I dread the thought
of fighting to get two 160lb batteries in
place inside the boat. Also, if I go with the
6volt plan I could expand my "tank" by
replacing the smaller Deka 8AGC2 with these
larger ones:
>US AGM L16 6volt, 390AHr, 123lbs, $500each
(same footprint just taller).
>Which would almost double my available
storage.
>
>Any one with real world advice on any of this?
>
>Links:
>http://www.civicsolar.com/product/mk-deka-batteries-8agc2
>http://www.civicsolar.com/product/trojan-battery-company-420-0094
>http://www.atbatt.com/product/24128.asp
>http://www.civicsolar.com/product/mk-deka-batteries-8a8dltp
>
>
>
>
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