Series/Parallel Buddy Wiring...?

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LandCrawlerATV
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Series/Parallel Buddy Wiring...?

:?

I’m developing a new type of electric 6WD ATV and could really use some quick help regarding the series/parallel wiring of the batteries. I have 4 large 12vt deep cycle batteries that I need to wire so as to provide 2 motors controllers (it turns two motors like a skid steer) each with 24 volts. Long ago I printed out a post that was on the old voltage forum but since it was not printed in color I’m now confused by the diagram.

I want to wire these up so as to help keep the batteries in balance and reduce voltage sag during heavy loads as was mentioned in the post.

Can anyone please help me? I need to place a wire/terminal order ASAP so if you can answer quickly it sure would be appreciated.

Thanks!!!

Jim

LandCrawlerATV
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Re: Series/Parallel Buddy Wiring...?

48_volt_batteries.jpg

Initial_LC_Wiring_Design.jpg

Chas sent me the diagram I was looking for. But on Chas's diagram I’m confused on what’s going on with the green wire connections. (And I havent yet heard back from him) Do the batteries all have a very short red wire from its positive terminal to it neighbor’s negative terminal and then a green wire connecting both of these to the other strip of batteries connected in the same way with a short red wire?

And in my situation with four batteries at 24 volts would I just omit the middle two batteries in each strip? I’d sure hate to get this wrong!

Also included is a diagram of how the batteries are positioned like a "T" and how I originally thought I'd wire them. Would something else be better?

I couls really use some help as I need to get the electrical parts on order no later than tomorrow afternoon so I can work over the weekend.

Thanks!

Jim

NickF23
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Re: Series/Parallel Buddy Wiring...?

Jim,

Yes, like you ask, the positive and neighbouring negative terminals are connected by a short wire. Go ahead and order the parts. Even if you were to wire them up as you orininally intended it won't affect performance very much, the main advantage of buddy pairs is in extended cycle life rather than performance.

Chas is the expert on this, I'm only venturing my opinion as you seemed to need a quick answer! good luck with the project, and don't forget to post back when you complete it, sounds pretty interesting, can't wait to see some pics.

LandCrawlerATV
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Re: Series/Parallel Buddy Wiring...?

Thanks for the comments Nick. Each 6.7" seperately excited Andvanced DC Land Crawler motor is coupled to a 25:1 gear reducer. Therefore top speed is only 12-15mph so outright vehicle speed is not a big issue. But torque and even more importantly battery life is. So its range and battery life I'm really after.

Any other comments are appriciated.

Jim

chas_stevenson
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Re: Series/Parallel Buddy Wiring...?

Jim,

Here is your diagram with an added green wire which is all you need to make the buddy pairs.

Chas S.
My Bicycle Pages

LandCrawlerATV
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Re: Series/Parallel Buddy Wiring...?

Can anyone tell me if theres any disadvantage of using a heavier gage wire than what might be needed? (other than weight) We're currently going with 0 gage high-flex (welding) wire in an attempt to get the most out of our batteries.
Thanks
Jim

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