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Author Topic:   Battery sizes
63WHALER posted 08-10-2002 09:25 PM ET (US)   Profile for 63WHALER  
In the process of re-wiring, and going to use the two battery set-up with switch. My question is,is the group 24 recommended or should I step up to group 27? Im using a 90hp. Johnson and light electronics. Would like to have opportunity to add on with more electronics although in future, sonar,GPS, trolling motor??

Thanks,
Kevin

Dick E posted 08-11-2002 09:23 AM ET (US)     Profile for Dick E  Send Email to Dick E     
I would stay with Group 24 .

I run 90 hp Merc, trolling motor GPS/Fishfinder, VHF radio etc. with two Group 24 batteries.

I would definately go the deep cycle route for both batteries.

triblet posted 08-12-2002 11:41 PM ET (US)     Profile for triblet  Send Email to triblet     
I run an 90HP Evinrude, GPS, depthfinder,
Console VHF, bilge pump, lights with ONE
dual-purpose Group 24 battery. I frequently leave the
electronics (less depthfinder), bilge pump,
and anchor light on for a couple of hours
while I dive.

Now, if I were to add a trolling motor, I'd
add a second battery, but not till then.
And it might well be bigger than Group 24.
The starting battery would be either starting
type battery or a dual-purpose. The second
battery would be a deep cycle.

BTW, AGM (Absorbed Glass Mat) batteries are
pretty cool. Admiral Linda got one for her
zillion CC Suzuki (motorcycle). Pricy, but
you can turn them upside down with the caps
off and no acid comes out. Overkill? Maybe.


Chuck

kingfish posted 08-13-2002 08:54 AM ET (US)     Profile for kingfish  Send Email to kingfish     
I have an Outrage 22' with two bilge pumps, VHF, GPS Plotter/Sounder,AM/FM/Tapedeck, standard nav. and anchor lighting, spot/flood, two rear flood lights, electric trim tabs and probably something I'm forgetting. I use a heavy duty automotove 24-group cranking battery and a heavy duty glass-mat deep cycle battery, also a group 24. Space was an issue with me as I really couldn't (didn't want to) afford space for group 27 batteries, so I went heavy duty with the 24's and am absolutely satisfied with the results.

BTW, adding to Chucks comments re: the AGM batteries; compared at least to gel deep cycle batteries (which also can be upside down with no loss of acid), AGMs can be charged just like a standard battery with no fear of permanent damage from over-charging.

kingfish

bocadrew posted 08-14-2002 10:32 PM ET (US)     Profile for bocadrew  Send Email to bocadrew     
Deep cycle? Curious about the differnce between batteries.
jimh posted 08-15-2002 01:14 AM ET (US)     Profile for jimh  Send Email to jimh     
http://uuhome.de/william.darden/ will provide you with a great deal of information on lead-acid batteries.
lhg posted 08-15-2002 03:28 PM ET (US)     Profile for lhg    
All of Whaler's classic desert tan battery boxes, boats 25' and down, were for Group 24 batteries, so that's what they recommended and used. I believe that with today's electronics, everyone should use a combination starting/deep cycle battery. I get mine at Walmart and have found them to be excellent, plus pro-rated replacement is readily available no matter where you travel. Deep cycle's ability to take recharges is particularly important if you have one those outboards with skimpy alt charging rates, since the alt will not recharge the battery as fast as you draw it down. When comparing outboard brands most don't check charging rates, but should. The Yamaha 70 comes to mind, with only 6 amps. Most big V-6's have 35-40 amp alternators. And those outputs are at full throttle. The problem is when trolling, when a lot of electronics are being used. My Lowrance Global Map 2000 combo draws at least 8 amps.

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