12 volt series parallel??

bolter

Just curious if it's feasible and what the benefits/issues would be. If I were to take 6 12volt batteries and hook them up in a series/parallel configuration would there be any advantages? I realize the added weight issue...

BGW

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redriderno22

well depending on the type of 12 volt batt it will probably be lighter than GC batts

and i have seen 12 volt batts used this way, but i cant say about run time?

if you have 6 6volt batts at 220 amp hours

or 6 12 volt in series parallel
and each 12 volt is 120 amp hour
then you should get 240 amp hours of juice from them.....

galloway

are you talking 12v deep cycle golf cart batteries or are you talking 12v car starting batteries?

there would be no advantages to doing what you are saying.
using Trojan batteries as an example:
http://www.trojanbattery.com/pdf/TNJ...ral0710_LR.pdf

a 6v t105 has 447mins@25amps, 115mins@75amps and the ah rating is 225/20hr and weighs 62 pounds

where a 12v t1260 has 260mins@25amps, 60mins@75amps and the ah rating is 140/20hr and weighs 78 pounds.

so you are looking at less run time, less battery life over all and about 100 pounds more weight by going with 12v's

bolter

yeah I would look at deep cycle, I was just curious as it would seem if you used 6 12 volt batteries you would have a longer run time if nothing else.. Just something I was investigating.

galloway

Just by general rule the smaller the voltage of the battery the longer the run time.

more lead equals more run time. think of lead as fuel.

Cheers
Galloway

mauistardog

If and that is a big if you could get the batteries to fit, why not run 72v and get faster with shorter distance ? I would do this in a heart beat, but I can't get 6 12v to fit much less 4 12v to fit without major cutting and welding within the existing battery bay. I have not found any deep cell 12v that are only 10 1/2 inch long, most are 11-3/4 to 12 inches.

aloha
joe

bolter

The reason why I am asking this is the we use these carts where I work as one of our modes of transport/work vehicles. I already made a speed chip for myself, which is plenty fast enough for the terrain (basically like being on an offroad course) and I can travel 20-30 miles a day. so the reason I ask is more along the lines of battery life as opposed to an increase in speed. Now if this was a personal cart, then we'd be talking about speed..

bolter

FYI here's the response I got from "Trojan"

The T1260 batteries in the configuration you describe would be rated at 270AH and the 6 volt T105 would be 225AH. Taking in to consideration the added weight of the T1260’s (468lbs vs 372lbs for the T105’s) an estimate of an increase in life of 15 – 18%.

galloway

yes the ah would be greater mathamatically.

but I was talking also about the amount of lead in the batteries also. 12v batteries have smaller plates that will have less life cycles then a 6v battery.

also with the added weight the motor will be pulling more amps to move the cart. so even though you are looking at the 15% increase in ah you have to look at what amps the motor is pulling.

so if the 6v setup and weight is pulling say 75 amps you are looking at
roughly 1.5 hours of run time. (225/2 = 112.5 / 75amps = 1.5 . . . you want to try not and run a pack down below 50% dod)

and the 12v is pulling 85 amps you are looking at 1.5 also. (270/2 = 135 / 85amps = 1.5)

but with the added strain on the motor you are looking at more heat etc. so you are getting about the same run time. But in the long run the weight is going to beat up the cart more make the motor run hotter and the batteries will have a shorter life one bc the size of the plates and to the higher amp draw bc of the weight.