Would like your thoughts on placing a pair of AGM Batteries under the seats about the midline of a 16' half cab glass boat. I am trying to get some weight a little forward because with the motor weight & 50 ltrs fuel & a dual battery setup at the very rear of the boat she's a little ass heavy. 145kg motor,50 kg fuel & 46kg batteries. (241kg total) Another question about getting some weight forward do you think the boat will get up on plane easier & at lower speeds doing this?
Hi
I did exactley what you are talking about doing in my last boat, it was a Haines 163C.
Put the batteries under the helm seat, keeps them dry, easy to get to, no problems.
The ideal would be to have a battery each side to keep even weight distribution, if you can wangle it.
Can't say I noticed any appreciable difference in geeting on the plane, but it stands to reason the more weight forward, the quicker it will get up.
Hope this assists
Cheers
Thanks mate, one either side sounds like a great idea too. Any suggestions on how you would run the cable ie up around the bunks to get to the other side or come from the back of the boat? Also did the position of the batteries in the Haines reduce the lifespan any?
Is there any problem,with power drop over that length?
It was suggested ,that my brother move the battery for the motor,closer to the motor,after a trigger coil went . He had a whopper of a cable,also,so I could not see the reason,for the recommendation.
Would really like to know ,as it would be great for me as well
David
HiOriginally Posted by Last Cast
I would not go all the way around the bunks etc, would end up with 4+ m of cable.
Directley across would be the way to go if you can, but would have to look at your layout to see how it could be done, just requires a bit of thought.
Running from the back would not work, you still have to "join" the 2 batteries.
I had the batteries 2 yrs + after doing it before selling the boat, they were still fine at that stage.
I have done the same thing in the present boat, which is a HH 19C, all good
Cheers
Hi David
I have not noticed any power drop at all, thick cable running from the back, heavy duty marine batteries, no problem.
Cheers
The only real drawback to me would be the extra hammering they will take when placed forward, it may cost you money and time (hopefully not offshore) than if they were place in the rear.
cheers fnq
Last edited by FNQCairns; 06-04-2008 at 07:59 PM.
My car has its battery in the boot, I am sure plenty of others do as well. At just under 5 metres in length, I would suggest that it is comparable to the cable length you are talking about here, so I don't see it as a big deal at all, providing they are wired up correctly.
The issue would be more FNQ's point, what sort of extra hammering are they going to take being located amidships?
Cheers
Dave
Aren't AGM batteries less susceptible to hammering/angle issues though? I mean you wouldn't deliberately try to hammer the life out of them, but aren't the supposed to offer more protection than standard lead acid batteries etc etc in this regard? Or maybe I've just been interpreting the marketing hype incorrectly
Almost without exception, race cars and rally cars have the battery in the boot for the same reasons... weight distribution....some of the new standard cars have them in the boot too.......as long as the cable is heavy enough there arent any problems.
as far as vibration......I cant see that any boat would give a battery the sort of hammering it would get in a car on a corigated road....the AGM most cretianly should cope with the vibration better than a battery with open cell plates.
You do need to be carefull with the cabling.
large size to allow for voltage drop
protecting the cable from damage because if it is a start battery you can not fuse the cable.
I recon the recomendation to shorten the battery cable, after a failed trigger coil.....grasping at straws.......there are lots of people who can't cope with anything unconventional & will blame that for failures they can't properly isolate.
for cable, check out a good welding supplier.........remember you need positive and negative..........wont be cheap.
as far as the effect on performance.........try moving the missus from the front to the back of the boat.......unless she's a heavy weight that will be a similar weight transfer.
I have also heard of people mounting the fuel tank up the bow for better weight distribution too.
cheers
Tried weight distribution with the missus up front & down back but found the boats balanced better with her left right out
Thanks for the tips, you made a good point with the vibration i guess 4wd batteries have had to cope too.
Looked at moving the fuel forward but the V berth is too small, not sure i want to sit on it either, so thought the batteries might be the easier option.
Will speak to the sparky at work re voltage drop etc
Thanks to all for your replies it gives me something to work on
ps better keep the weight thing & my missus on the quiet!
Cheers,
trying to get any info re weight distribution as I am the middle of removing well and replacing with a pod.
Voltage drop (more importantly crank amps) over 4.5m, provided good connection is negligible.
From what I have been advised put your money into extra (aux) fuel tanks .......
Oldboot,
How many amps would a starter motor draw on a 90 hp Yammie,2 stroke?
David
Old boot,are you out there
David
as far as vibration......I cant see that any boat would give a battery the sort of hammering it would get in a car on a corigated road....the AGM most cretianly should cope with the vibration better than a battery with open cell plates.
Good point
Cheers
Bill
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