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AlLorman 11-03-2011 10:06 AM

PSC 31 battery set up
At some point before I bought her, the PO of my 31 removed the original battery set up and dropped two group 31s in. My surveyor insisted that they be put in boxes, so the PO had a yard do that, and the yard used such short screws to hold down the boxes that I now have two free-floating battery boxes. One of my (many) winter projects is to do some rewiring and install proper battery boxes. I plan on two T 105s and a starting battery. I would appreciate hearing from other 31 owners about their battery set up. I would also welcome digital photos.

Many thanks.

Al Lorman
s/v Ann West, PSC 31 No. 55

orientalnc2010 11-04-2011 06:35 PM

Hi Al,
I have two AGM group 31 house batteries that came from the factory. They are in the starboard lazarette against the bulkhead and are not in battery boxes, most likely because they are AGMs. They are bolted down securely with a piece of "starboard lumber" each battery and 3/8 threaded rod connecting them to the lazarette floor. Sorry no pics at the moment but can get some if you want to see this arrangement. Doesn't sound like my set up with be of use to you since I do not have battery boxes.
The starting battery is group 27 AGM located over the stuffing box. Due to space limitations it is on its side and does not have a battery box.

AlLorman 11-04-2011 07:07 PM


Many thanks for your reply. Right away I notice one big difference between our boats (besides the battery chemistry): You said that your batteries are bolted down securely with a piece of "starboard lumber" and 3/8 threaded rod connecting them to the lazarette floor. The floor of my lazarette consists of several ill-fitting pieces of wood that seem to simply sit there. Underneath them is a sheet of plastic which is over the holding tank area. Thus, I've not been able to figure out how I could securely attach anything to the lazarette floor.


orientalnc2010 11-05-2011 11:53 AM

Hi Al,
If you have nothing solid to secure to then you may need to glass in some cleats to secure a new locker floor too. Not a bad job as access is good. There is lots of good info on west epoxy's website on how to proceed, wood bonding to fiberglass etc.

JohnRPollard 11-05-2011 03:43 PM

Hi Al,

Our 2xGrp 31 AGMs are secured in essentially the same manner as Steve's, and we've never had any issues.

It sounds like your surveyor made the PO fix something that wasn't broken or hazardous, but the "fix" is. Also, I don't think the P.O.'s switch to GRP 31 would have altered the original set-up in any way. Our boat originally had 2xGrp 27s, but no change was necessary for the Grp 31s -- they are for all practical purposes the same dimensions (but different weight.) In fact Grp 27s and 31s use the same size plastic battery box.

As for adding the third starting battery -- I've wanted to do that too for a long time but have never got around to it. If I did add one, I've concluded I'd put it on that little shelf just above and aft of the stuffing box. Others have put it there, too. Here is where an AGM or similar would be best, since it could be installed on its side which would allow much easier access to the posts for cable attachments.

AlLorman 11-05-2011 07:56 PM


Since your hull is seven numbers after mine, I suspect our boats came from the factory pretty much alike. I would be very grateful inf you can send or post some photos of your set-up, or, alternatively, let me come by and take some photos.

Many thanks.


adamowens 11-07-2011 11:23 AM

Here is a photo of my house bank. It is 4 t105's in a box I built out of 1'2 marine ply and epoxy. I went with four batteries so that if any battery went bad that pair could be removed and I would still have a functioning house bank at 1/2 the capacity.

I use a Odyssey marine start battery mounted on the little shelf above the stuffing box. It is very small for the cranking amps it produces.
All charge current goes to the house bank and the start battery is charged via a Xantrex Echo-charge. I use a Blue Sea 8686 dual battery distribution panel. It allows both banks to be turned on with a single switch and remain isolated. It has a second position for emergency parallel.

PSC 31 journey

adamowens 11-07-2011 11:25 AM

adamowens 11-07-2011 11:40 AM

AlLorman 11-07-2011 11:42 AM

Many thanks, Adam. Except for the number of T105s, you're system is very much like what I plan. I have an Echo Charge and I have an uninstalled Blue Sea battery switch that does the same thing as your panel.


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