Here is a theoretical question that I am sure has been answered way too man=
y times, but here goes again.
Small car - 2500 - 2800 lbs converted
runs on 12 golf cart batts
Two setups (same small car):
#1 - 12 ea 6 V golf cart batts, 72 V system, 9" ADC motor, Alltrax 7245, 5 =
speed manual transmission
#2 - 12 ea 8 V golf cart batts, 96 V system,7" D-DMotor,Curtis 1231C,=
4 speedmanual transmission
Here is my take:
Range - Car #1 wins. 6 V GC batts will get you farther than 8 V GC batts=
. Smaller controller / lower voltage is easier on the batts. This see=
ms to be everyone's experience that goes from 6 V to 8 V. You lose range=
and batt life.
Performance - Car #2 wins. Hands down, #2 will accelerate better. May=
be 20-30% better
Top speed - Car #2 will be slightly higher, but that 7" motor isn't helping=
. The 5 speed trans and9" motor on #1 helps compensate for the lower =
72 V car.
Batt life - #1 wins. 6V last longer than 8 V. They are being treated =
nicer by the smaller controller and more efficient motor. #1 wins by a l=
ot in this category. Also, since range will be less on the 8 V car, give=
n the same driving conditions, #1 has the added advantage of less DOD.
Car #1 is my car, and I've run it all the way from 132 V on 12 V AGMs down =
to 72 V on 6V GC. I've run it on almost everything in between 84 V, 9=
6 V, 120 V both 6 and 12 V batts. I never used any 8 V batts because my =
experience with 12 Vwas so bad I went direct to 6 V. 16 batts is too =
much weight for it. 14 is iffy. 12 is just about right for weight.
The question is: Did I make the right choice with the 6 V GC batts, or s=
hould I have gone with 8 V GC bats? I put the car up for sale a while ba=
ck. Now pulled it off the EV Tradin post, at least for a while. I alw=
ays get the same questions. Why are you running only 72 V? Is this ca=
r really 55 MPH capable? Well, I've driven it that fast, but it isn't as=
fast as on 96 V. Ithink I made the right component choice for a smal=
l commutter car that rarely goes 55 MPH, typically only 40 MPH. It seems=
the rest of theworld disagrees. So, should I have gone with the 8 V =
batteries? The car is no longer advertized for sale, and I may just keep=
it. If I replace the pack with 8 V and the controller with a 1231C, how=
much of a range hit and battery life hit will I take? All for the sake =
of higher top speed (which I never use) and faster acceleration (which I li=
ke, but is hard on the batts).
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