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  #1  
Old 11-29-2009
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Question J24 Battery Location

Hi all,

I have received my boat and stored it for the winter. One thing I failed to locate while preparing it, was the battery location.

I did not spend a great deal of time following all the wiring, however while I plan all winter, it would be nice to know in advance where it naturally is placed.

Further, does anyone have experience with a solar trickle charger. We have a small outboard with the boat and I am thinking the pairing of a deep cycle marine battery, an inverter and a solar set up is probably the way to go if I want lights to operate at night.

Thanks in advance.

Greg
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Old 11-30-2009
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Its in the forward V-Berth under the boards on Starboard

I have a pretty small battery and just charge it 2 times a season ,I finish a lot of races in the dark and as the nav light only draw 30 watts i have never had and issue.
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1981 J24 Tangent 2930
Tommays
Northport NY


If a dirty bottom slows you down what do you think it does to your boat
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Quote:
Originally Posted by tommays View Post
Its in the forward V-Berth under the boards on Starboard

I have a pretty small battery and just charge it 2 times a season ,I finish a lot of races in the dark and as the nav light only draw 30 watts i have never had and issue.
Uhhh, it could be anywhere

If the boat's ever been raced seriously it'll likely be under the port bunk as far forward and toward centerline as possible, and the engine will generally be stored under the starboard bunk with the power unit forward.

Battery up front like that will be dog slow compared to a position roughly over the keel and balancing out the engine.

Keep weight low, keep weight out of the ends of the boat
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Old 11-30-2009
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Why do you want an invertor?
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Yes that 20# battery just kills boat speed
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1981 J24 Tangent 2930
Tommays
Northport NY


If a dirty bottom slows you down what do you think it does to your boat
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every bit matters, and given that the mast is too far forward on those boats, forward of the mast is non-good!

Anyway, something needs to balance the engine and anchor. Best to get a battery as close in weight to those two, and mount it to balance them out. Note that those mounting locations are as close to the middle of the boat as is practical, which means that any pitching moments are minimized. A really "sneaky" (competitive) owner would weigh his boat 100% empty and without corrector weights, and then figure out how much his optional "stuff" listed in rule 6 needs to weigh to get the boat up to 1270kg and then buy up to that weight before the boat is weighed for measuring. You'll note that the class rules specify a battery MAX weight of 25kg - why in the world would they specify a max weight, surely you'd want the lightest possible right... well, what if you had a light hull and wanted to get it up to weight without putting corrector weights in (which must go forward and aft of the bulkheads and are therefore BAD)? Note that your battery placement is forward of the bulkhead, something a lot of people fight to avoid.

Weight and weight placement matters a lot on a J/24

Similarly (and yes you weigh a lot more than a battery) the helm should only be aft of the traveller during a tack or a gybe. Weight should be as close to the area between the mast and the companionway as possible - ends of boat = baaaad! Downwind you could consider having someone sit forward of the shrouds (basically touching the shrouds and not a bit further forward) to help pull the back of the boat out of the water a bit but maybe your forward battery takes care of that one
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Thanks for the note. I will start my search again in the spring.

I want an inverter because I assume the entire system doesn't run on 12v.. maybe I am wrong on that one.. I am just learning.

As for balance and weight, etc.. we are not racers. We got a good deal on the J as our first boat. Worst case scenario we will sink it and go buy something else. (If that happens I will be sure to post the story here).

Best case scenario, it lasts us for the rest of our lives as our day sailor of convenience as the lake is about a 5 minute drive from our house.
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My battery is BEHIND the mast under the V-Berth

"A really "sneaky" (competitive) owner would weigh his boat 100% empty and without corrector weights"

Having only owned two hulls since 1981 and run a large fleet i clearly lack any understanding other than CHEATER thinking like yours has caused the boat measurement process to become a FUBAR mess.

You have people having to stick quarters under there mast and dig illegally placed lead out of there keels to measure in legal at the worlds this year On BOATS THEY USED TO MAKE THE WORLDS
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1981 J24 Tangent 2930
Tommays
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If a dirty bottom slows you down what do you think it does to your boat
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Last edited by tommays; 11-30-2009 at 07:51 PM.
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Drake
You will need an invertor for the microwave oven, toaster, and washer/drier but not for lights and other equipment normally installed on a J24. And if you had an invertor, the battery would last about long enough to make some toast and eggs before it would be flat.
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Good to know. I will let Santa off the hook for the invertor and insist an electrical engineering bible.
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