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 > 4 X12 = 6 X 8?

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TomG2

Central Illinois

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Posted: 10/14/20 05:20pm Link  |  Quote  |  Print  |  Notify Moderator

We have a 48 volt golf cart which sees very light use. Maybe two miles per week. The six 8 volt batteries are getting tired. I already have two group 27 12 volt Deep Cycle batteries and am asking if the charger and any other electronics would recognize and utilize the 48 volts provided by the four 12's.

I already know some will say, "Get 6-8's" or maybe "8-6's". I am hoping that the 4 12's would power the cart for a couple of miles a week with charging readily available. $300 vs $800 makes me want to try it.

2oldman

Mecca

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Posted: 10/15/20 04:53pm Link  |  Quote  |  Print  |  Notify Moderator

No problem. I put 3 12s in a 36v cart. Works fine.

The range isn't as good as with more amp hours but it works.

time2roll

Southern California

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Posted: 10/15/20 05:26pm Link  |  Quote  |  Print  |  Notify Moderator

As long as you use a semi deep cycle and it adds up to 48 volts and always keep the batteries top charged you will be fine. Go easy on the throttle too for longest life.


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deltabravo

Spokane, WA

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Posted: 10/15/20 08:12pm Link  |  Quote  |  Print  |  Notify Moderator

TomG2 wrote:

I already have two group 27 12 volt Deep Cycle batteries


Are they new?

If not, then buy four new ones from the same brand.

It's not recommended to mix new and old batteries together.


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Gdetrailer

PA

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Posted: 10/15/20 08:43pm Link  |  Quote  |  Print  |  Notify Moderator

Group 27?

Those are RV/Marine batteries which are "combination" starting/deepcycle, they do either job poorly. Basically built for light duty trolling motor applications or in a pinch starting a small gas engine.

With a GC it won't take long to destroy the group 27 RV/marine batteries..

Many yrs ago, my Dad tried RV/Marine batteries in his truck for starting and to power the TC.. Didn't work well for starting his truck on cold winters days and marginally worked OK for the TC.

If you want your GC to work correctly, just go to Sam's or Costco and get their 6V or 8V GC2 batteries and be done with it those batteries are reasonably priced and work well.. No need to buy super expensive name brand GC batteries..

TomG2

Central Illinois

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Posted: 10/15/20 08:53pm Link  |  Quote  |  Print  |  Notify Moderator

Gdetrailer wrote:

Group 27?

Those are RV/Marine batteries which are "combination" starting/deepcycle, they do either job poorly. .go to Sam's or Costco and get their 6V or 8V GC2 batteries..


They are labeled Deep Cycle with 109 AH rating. No starting rating. Both are less than six months old and work great for camping trips.

8-6's will not fit.

wa8yxm

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Posted: 10/16/20 05:25am Link  |  Quote  |  Print  |  Notify Moderator

Well six times 8 is 48 volts and 8 times 6 is also 48

But are they arranged as 48 volts or 24 volts?
Some Golf cars run batteries
battery-Battery-Battery-Battery
(All in series)
and some run
Battery-Battery
Battery-Battery
(Series/Parallel)

NOTE it really does not matter for the question. So long as the number of batteries is EVEN.


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TomG2

Central Illinois

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Posted: 10/16/20 07:42am Link  |  Quote  |  Print  |  Notify Moderator

2oldman wrote:

No problem. I put 3 12s in a 36v cart. Works fine.

The range isn't as good as with more amp hours but it works.


Thanks. I figured it would work but thought that I might have missed something. Not worried about range as I have shore power available at both ends of my daily 1/4 mile run.

mr_andyj

Georgia

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Posted: 10/16/20 08:34am Link  |  Quote  |  Print  |  Notify Moderator

x2 on DO NOT run marine batteries. They will live a sad and short life.

Actually, I cant think of any reason I would want or need a marine battery, other than maybe on a boat to start the big motor, and be able to run a trolling motor a little bit on the same outing off of the same one battery.

Bring oars just in case you deplete the battery from too much trolling and cannot start the big motor back.

MEXICOWANDERER

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Posted: 10/16/20 09:09am Link  |  Quote  |  Print  |  Notify Moderator

It is important to make sure all batteries in a series string are equal in ampacity and there are two ways to do this...

Charge then load test each battery seperately, If say the load test calls for 250 amps loading for a 500 CCA battery, I would reject any battery that deviated by three tenths of a volt.

In operation, any battery at rest that deviates .3 volt from the rest of the string should be culled. One meaning single battery in a series or series parallel configuration can damage or destroy the remainder of the batteries given enough time.

Regarding ANY high priced battery: If the manufacturer dodges this question my advice is to move on, rapidly: "Is this battery made of virgin lead?

I can only assert that the flooded Rolls and Surrette car jar batteries are of virgin lead. They can be mistreated more than recycled Pb and successfully recovered. If you do not know how to recover a mistreated battery, virgin lead cost makes it a waste of time and money.

I have not been inside a battery since the group 34 Wal-Mart failed on me. And the visible porosity on the intercell straps, one of which failed, discouraged me from returning it for warranty -- that and a pimple faced youngster that insisted he knew more than I did about batteries.

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