Pond Boss Magazine
http://www.pondboss.com/images/userfiles/image/20130301193901_6_150by50orangewhyshouldsubscribejpeg.jpg
Advertisment
Newest Members
TerryDesilets, threeforme, wisco55, Damon@FCL, Mike Whatley
15291 Registered Users
Forum Stats
15291 Members
36 Forums
35279 Topics
481756 Posts

Max Online: 1039 @ 03/28/13 02:44 PM
Top Posters
esshup 24021
Cecil Baird1 20043
ewest 19231
Dave Davidson1 13272
Theo Gallus 12356
Who's Online
17 registered (Lake Vilbig - Al Kohutek, ShaneM, jason7858, JKS3613, fishwhiz, John Fitzgerald, tommyt, anthropic, Shorty, azteca, Vortex 4, Hoosierguy86, highflyer, Tbar, Twar, Theo Gallus, N.TexasHalfAcre), 203 Guests and 415 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
#288209 - 04/17/12 07:51 PM Parallel wiring of batteries--size of wire
Bing Offline
Ambassador
Hall of Fame 2014

Lunker

Registered: 05/03/02
Posts: 1598
Loc: Fayette County Illinois
I plan to use two 12 vt. batteries in parallel in my bass boat this year. The object is to create more battery life per charge with the same 12 vt. output. The batteries will power the trolling motor, depth finder, live well and bilge pump.

The batteries will be side by side, so the wires will be just a couple of feet long. What size wire should I use between the battery posts?
_________________________
And now for a lil mechanical engineering....I'm going to put a rear end in my recliner!

Sushi is fish for men who do not know how to build a fire.

Top
#288216 - 04/17/12 08:44 PM Re: Parallel wiring of batteries--size of wire [Re: Bing]
catmandoo Offline
Moderator
Ambassador
Field Correspondent

Lunker

Registered: 08/08/06
Posts: 5667
Loc: Hampshire Co., WV
Bing -- Over the years I've helped a number of friends do what you want to do, but mostly in campers and motorhomes. What you want to do is very common. If you go to an RV/motorhome center, like Camping World, they should have complete cable kits for connecting the batteries in parallel. I'm guessing they have similar kits, for boats, at the big box sporting goods stores, like Cabellas, BassPro, and Gander Mountain. I just couldn't find any by searching web sites.

Regards,
Ken
_________________________
Subscribe to Pond Boss Magazine

Peculiar Friends are Better than No Friends at All!

Top
#288218 - 04/17/12 08:50 PM Re: Parallel wiring of batteries--size of wire [Re: catmandoo]
ewest Offline
Moderator
Hall of Fame 2014

Lunker

Registered: 03/08/05
Posts: 19231
Loc: Miss.
I did that on feeders. I could not tell that it worked any better.
_________________________















Top
#288223 - 04/17/12 08:56 PM Re: Parallel wiring of batteries--size of wire [Re: ewest]
sprkplug Offline
Ambassador
Lunker

Registered: 06/02/08
Posts: 6944
Loc: Freedom, Indiana
If you're close to an Interstate Batteries center, they'll have what you need.
_________________________
"Forget pounds and ounces, I'm figuring displacement!"

If we accept that: MBG(+)FGSF(=)HBG(F1)
And we surmise that: BG(>)HBG(F1) while GSF(<)HBG(F1)
Would it hold true that: HBG(F1)(+)AM500(x)q.d.(=)1.5lbGRWT?
PB answer: It depends.

Top
#288227 - 04/17/12 09:01 PM Re: Parallel wiring of batteries--size of wire [Re: sprkplug]
JamesBryan Offline


Registered: 07/11/11
Posts: 475
Loc: N.W. Missouri
Go with the same size as is going to your starter and your ground lug.Go to your auto parts store, they should have what you need for battery cables. You'll need cables rated at carrying the full load. I think it's #4 gauge, but dont quote me on that.
_________________________
Give a man a fish, and he will eat for a day. Teach a man to fish and he will sit in a boat and drink beer.

Top
#288249 - 04/17/12 10:21 PM Re: Parallel wiring of batteries--size of wire [Re: JamesBryan]
Bing Offline
Ambassador
Hall of Fame 2014

Lunker

Registered: 05/03/02
Posts: 1598
Loc: Fayette County Illinois
By the way, my boat does not have an engine. Use it on my 3 acre pond and bought it without engine or wiring for an engine.
_________________________
And now for a lil mechanical engineering....I'm going to put a rear end in my recliner!

Sushi is fish for men who do not know how to build a fire.

Top
#288257 - 04/17/12 10:38 PM Re: Parallel wiring of batteries--size of wire [Re: Bing]
JamesBryan Offline


Registered: 07/11/11
Posts: 475
Loc: N.W. Missouri
I guess you cant match up with your starter then. sorry, laughing. You will want to find out the total amp draw from all appliances, as if they were to be running at the same time.A general rule of thumb, is 10 ga. = 30 amps,8 ga. = 40 amps. I'd find that out, then go the next size bigger, to ensure equal discharge.
_________________________
Give a man a fish, and he will eat for a day. Teach a man to fish and he will sit in a boat and drink beer.

Top
#288258 - 04/17/12 10:39 PM Re: Parallel wiring of batteries--size of wire [Re: Bing]
esshup Offline
Moderator
Ambassador
Field Correspondent

Lunker

Registered: 01/26/09
Posts: 24021
Loc: Grovertown, Indiana
Any auto parts store should have wire with lugs swaged on the ends. Shorter the better. I wouldn't go any smaller than 6 ga wire. Chevy diesel trucks use 2 batteries, and those cables would work, but they are longer than what you need.

If you can get wire with swaged lugs that are sealed, even better. (to prevent corrosion.)
_________________________
www.hoosierpondpros.com


http://www.pondboss.com/subscribe.asp?c=4
3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).

Top
#288285 - 04/18/12 05:46 AM Re: Parallel wiring of batteries--size of wire [Re: esshup]
JKB Offline
Hall of Fame 2015
Lunker

Registered: 12/03/09
Posts: 6692
Loc: Michigan
Minimum 6 ga if only a foot or two. Not quite sure what my camper cables are, but pretty sure they are quite a bit larger than 6 ga. My medium duty jumper cables are 4 ga. Didn't want to spend the money on heavy duty ones.

You can't size wires for DC as you do for AC. Voltage drop is terrible for DC compared to AC, so the wires have to be larger.


Edited by JKB (04/20/12 06:13 AM)

Top
#291340 - 05/11/12 06:14 AM Re: Parallel wiring of batteries--size of wire [Re: Bing]
liquidsquid Offline


Registered: 11/20/11
Posts: 1876
Loc: East Bloomfield, NY USA
If you have a load of a motor, and lets say for example it draws 40A at 12V continuous, you then wire another battery in parallel with the first, now each battery will only need to source 20A to the load. So you will still need the heavy gauge wire to the motor from the battery pack, but you now only need 1/2 of the wire diameter between batteries. With more batteries, you can get fancy with the wiring to minimize copper, but I don't need to go there.

With that said, you are likely better-off using the same gauge as to the load for terminal sizes and posts to match up.

What you will find at the end of the day is longer run time, longer charge time, and probably better starting performance as two batteries can better-supply surge current to a starting electric motor.
_________________________
Bear with me, just learning...

Top

Today's Birthdays
cobra01, Dan123, micam5, Rich B, woodster
Recent Posts
Cormorants discouraged...for now
by anthropic
Wood duck residences
by Vortex 4
Bluegill feeding frenzy
by anthropic
White fungus - anyone know what it is?
by Lake Vilbig - Al Kohutek
Help Please! Fish Kill
by Hoosierguy86
05:29 PM
Pk shrimp larva
by canyoncreek
05:28 PM
Intro
by ewest
03:02 PM
Hall of Fame 2018
by Pond Boss
02:45 PM
North Texas 1/2 Acre Existing Pond - Few Fish
by snrub
01:44 PM
BING ALERT!!!!
by Sunil
01:38 PM
Newly Uploaded Images
Question on pond draining
King Fisher
Tree Swallow grooming---Female Red-wing black bird
WHEEL BUG
Ducks3
This mornings photo.

2014 POND BOSS INC. all rights reserved USA and Worldwide