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Discussion Starter #1
hi,

I am playing with 4 12v40ah vrlas i was given for free. After placing
then in a 12 volt charger until it floated them, I hooked them up in series
to my 48v charger.

After a couple of days of charging slowly and floating, they now read
13.76 13.06 13.02 and 14.33 while floating to 55v and 12.85 12.65 13.00 and
12.83 resting.

Will they equalize more without regulators if I leave them on float
for weeks? they have a bit so far, when I started, the weakest batt was 12.66
amd the strongest was 14.5 while charging.
Can I tell if they are bad just from this numbers?

thanks,

--
Eduardo K. |
http://www.carfun.cl | I'm white and nerdy
http://ev.nn.cl | Weird Al
|

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Discussion Starter #2
Hi Eduardo,

It looks like the first and the last look weaker, from the
fact that while floating them they are higher than the others
while they are average after disconnecting the charger.
But the real test is always in the load-test.
Let them supply a decent load (between 20 and 100 Amp) and
see whether they keep up that load for a good portion
of their spec'ed 40 Ah.

Success,

Cor van de Water
Systems Architect
Proxim Wireless Corporation http://www.proxim.com
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-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Eduardo Kaftanski
Sent: Tuesday, October 09, 2007 8:15 PM
To: Electric Vehicle Discussion List
Subject: [EVDL] balancing VRLAs


hi,

I am playing with 4 12v40ah vrlas i was given for free. After placing then in a 12 volt charger until it floated them, I hooked them up in series to my 48v charger.

After a couple of days of charging slowly and floating, they now read
13.76 13.06 13.02 and 14.33 while floating to 55v and 12.85 12.65 13.00 and
12.83 resting.

Will they equalize more without regulators if I leave them on float for weeks? they have a bit so far, when I started, the weakest batt was 12.66 amd the strongest was 14.5 while charging.
Can I tell if they are bad just from this numbers?

thanks,

--
Eduardo K. |
http://www.carfun.cl | I'm white and nerdy
http://ev.nn.cl | Weird Al
|

_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev

_______________________________________________
For subscription options, see
http://lists.sjsu.edu/mailman/listinfo/ev
 

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Registered
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Discussion Starter #3
I'm sorry, I don't have any suggestions, but I am
really looking forward to hearing everyone's response
to this. It's what I've been wondering for some time;
how to best handle "different" batteries in series.
How do you make the best of the situation where you
are given random used/abused batteries, and how do you
make the best of the situation where one battery goes
dead and you replace it with a used or new battery.

Thanks,

Steven Ciciora


--- Eduardo Kaftanski <[email protected]> wrote:

>
> hi,
>
> I am playing with 4 12v40ah vrlas i was given for
> free. After placing
> then in a 12 volt charger until it floated them, I
> hooked them up in series
> to my 48v charger.
>
> After a couple of days of charging slowly and
> floating, they now read
> 13.76 13.06 13.02 and 14.33 while floating to 55v
> and 12.85 12.65 13.00 and
> 12.83 resting.
>
> Will they equalize more without regulators if I
> leave them on float
> for weeks? they have a bit so far, when I started,
> the weakest batt was 12.66
> amd the strongest was 14.5 while charging.
> Can I tell if they are bad just from this numbers?
>
> thanks,
>
> --
> Eduardo K. |
> http://www.carfun.cl | I'm white and nerdy
> http://ev.nn.cl | Weird Al
> |
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>




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