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Winter re-wire; Upgrading Batteries (presently two) three or add the fourth as well?

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Winter re-wire; Upgrading Batteries (presently two) three or add the fourth as well?

Old 10-07-2011, 07:42 PM
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Default Winter re-wire; Upgrading Batteries (presently two) three or add the fourth as well?

Need some input regarding adding batteries during the re-wire. I presently have two batteries that act as starting and house for my twins on a 26 foot CC. It has gotten to the point I have to much load for the two batteries. This boat was never designed for this much stuff. While Iím at this I figured maybe I should bite the bullet and run four instead of the three I was initially planning. Batteries will be relocated from stern to front of the cuddy. Batteries will be Cabelasí AGMís (have 7 seasons on my pair now). These are group 27ís. Thought about keeping two 27ís for port/starboard and going up to 30ís for the two house batteries.

Here is what I have presently for load:
Raymarine RL70 radar/chartplotter
Raymarine 770 fishfinder/chart plotter
Raymarine DSM300 sounder
Raymarine 2kw radome
Raymarine Smart heading sensor (not yet installed)

VHF/ with remote speaker
JBL Head unit with two Bose 151 box speakers
Sirius Sat antennae w/receiver (sportster)
Two Lunar LED lights
Two bilge pumps
Courtesy lights
Raw water washdown pump
Freshwater washdown
Running lights


Here is what I would like to add:
LED under gunnel lights
2-3 Underwater lights
New head unit (future)
1-2 pairs of JL speakers (future)
Amp? (futue)
Additional front LED deck light
Additional Bilge pump
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Old 10-07-2011, 08:12 PM
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Figure out all the amps those items require and work backwards from there for battery capacity.
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Old 10-08-2011, 04:37 AM
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That is the first order of business. My guess is one could get by on three (two starts and a house), but I'm a big believer in the piece of mind aspect. That is why I asked for some feedback to see what others had done.
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Old 10-08-2011, 05:19 AM
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If you have room and don't mind the weight, you can use two batteries in parallel tor a house battery. Use the largest capacity (in amp hours) that you can reasonably install. I have a four battery house bank, Sears AGMs but I suspect I use my boat differently from how you use yours.

Adding up the current draw of everything is a start, but you won't be using everything at the same time and the current draw of the sound system varies with the volume and type of music so it's just a ballpark figure.

Be sure to use proper overcurrent protection and wire everything to ABYC standards.
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Old 10-08-2011, 05:43 AM
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I like the 3 battery set up with a portable AGM starter battery. Provides a bit more flexibility and you always have an isolated source of power.... but that just me. Having redundancy is great but if it's all connected via house wiring your exposure is common, especially if there is a heavy fault.
You can buy them at any ampacity you want. I have this one... Schumacher PSJ-2212 DSR ProSeries 2200 Peak Amps Jump Starter and Portable Power UnitName:  Shumacher jump starter.jpg
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Old 10-08-2011, 05:46 AM
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I have 6 batteries. 3 banks. 2 batteries a bank. Each bank starts a motor and carries a portion of the house load. Any battery bank can be paralleled to any other. 3 stereo amps underwater lights 2 12 in screens 4 electric reel plugs undergunnel lights spreader lights t top lights 24v radar
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Old 10-10-2011, 02:10 PM
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Originally Posted by DavenFla View Post
I like the 3 battery set up with a portable AGM starter battery. Provides a bit more flexibility and you always have an isolated source of power.... but that just me. Having redundancy is great but if it's all connected via house wiring your exposure is common, especially if there is a heavy fault.
You can buy them at any ampacity you want. I have this one... Schumacher PSJ-2212 DSR ProSeries 2200 Peak Amps Jump Starter and Portable Power UnitAttachment 196622
Way to roll.
I add batteries until the boat starts to list.
I like the Optima M31's because they will fit in the 27 size and ya don't have to check the water (acid) level.
We're hearing Optimas quality has backed into hell since their takeover by Interstate,, so we'll see for our selves and report back.
You can never have too many batteries.

The portable jump starter is great when ya fall (in a drunk) asleep and run all the batteries down with the accessories running like the TV's.
Hey,, it happens.
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Old 10-10-2011, 06:09 PM
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Thanks for all the replies. If I can get four in I'm tempted. It would be a real piece of mind thing. I like the jump pack option as well though. My luck I'd always leave it at home. I'm gonna price it out though.
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