Re: (ET) 12v to 6v

[Tim Humphrey <hump evgrin com>]

Hi John;

A little primer.

Batteries have voltage and amphours. you multiply the two and you get a 
batteries capacity - watthours.

So a 12 volt 90 ah 70lb battery has 1080 watthours of capacity.
also a 6 volt 180 ah 70lb battery has 1080 watthours of capacity.

Notice the watthours and weight are the same??? Theoretically this is 
true, however the 12v battery will have more plastic and less lead so will 
also have [slightly]less capacity in the same size case.

If you hook the batteries up positive to negative in a string it is called 
a series string and the voltages will add while the amphours remain the 
same. So with the above batteries 6 -6volters will give 36volts and 180ah 
while 6 - 12 volters will give 72 volts and 90ah.

If you hook all of the positives to each other and the negatives to each 
other it is called parallel, and the ah's add while the voltages remain 
the same. So 6 - 6volters in parallel will give 6 volts and 
1080ah's(6480wh's). While 6 - 12volters will give 12 volts and 540 
ah's(6480wh's).

So we can hook 6 - 6 volters in series for 36v and 180ah, or we can hook 
3-12 volters in series and the parallel them with three more 12volters in 
series for 36v and 180ah, Or hook three sets of two paralleled 12volters 
in series for the same thing(like what you have).

Most elec-traks use the 6-6volters all in series....

Why? Because the 6 volt deep cycle batteries have been around for a long 
long time, they are cheap and rugged and fill the need. There is no 
cheaper way to buy lead acid batteries.

So basically yes. You can rewire your 141 with 6 - 6 volters if they will 
fit, (they should). The charger will work fine. The only issue will be the 
connections for the accessories like the lights and lifts, however I 
believe the 141's used all 36 volt components so that may not be an issue. 
Someone will correct me if I am wrong.

Stay Charged!
Hump



Original Message -----------------------


-----Original Message-----
From: elec-trak-bounces cosmos phy tufts edu
[mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of John Carlarne
Sent: Wednesday, October 12, 2005 12:29 PM
To: elec-trak cosmos phy tufts edu
Subject: (ET) 12v to 6v



Hi all,

I am now thinking of trying to convert my E-141 from running on 12v
batteries to running on 6v batteries. Has anyone done this? If so could you
let me know how you did it? I would welcome any suggestions. Since the
tractor was built to use six 12v batteries series connected as two sets of
three, with the sets wired in parallel, I was wondering whether I could get
away with wiring 6 x 6v batteries in parallel. The 6v batteries that I have
found have more than twice the amp hour rate of the 12v that I have found.

What would all this mean for charging batteries using the charger that 
plugs
into the tractor?

Many thanks, and apologies for all the questions,

John

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