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Discussion Starter #1
I just want to verify the voltage I should be charging my flooded 6V
batteries. In my research, it was around 2.48V per cell. Meaning around
15V for a 6V battery, and about 120V for my 16 6V batteries. Does this
sound right? I also understand that the voltage should be increased in cold
weather. So as the temperature is around 40 F as the low, I should adjust
it up to around 2.8V per cell. They are basically new, having received them
at the beginning of September.

Also, out of curiousity, what is the voltage per cell that agms should be
charged at?

Thanks for all help.

Brian
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Discussion Starter #2
Hello Brian,

It would be 2.48 v x 3 = 7.44 v per 6 volt battery at a battery temperature
of 80 F. Add .028 volt per cell for every 10 degrees below 80 F. so this
would be 4 x .028 v = 0.112 volts per cell. For a 6 volt battery that would
be 3 cells x 0.112 v = 0.336 volts.

7.44 volts at 80 F would be about 7.44 + 0.336 = 7.776 volts or which is
about 2.59 volts per cell.

The 7.77 or 7.78 volts would be a equalization charge at 80 F which is four
times the rate per 10 F degree change. So if you do equalization charge at
40 F. Then you would add 0.028 v x 4 = 0.112 volts per cell or 0.336 volts
for a 6 volt battery.

This makes a equalization charge at 40 F. equal to 7.776 + 0.336 = 8.112
volts.

You do not have to do this equalization charge on a daily basis, only if
your battery voltage is not in with of 2 to 3 percent of each other.

The maximum I ever charge my batteries which were in a un-insulated
aluminum battery box was at 2.78 volts per cell which held the voltage as a
maintainer at any temperature below 40 F. The batteries never went below 30
F.

Roland


----- Original Message -----
From: "Brian Staffanson" <[email protected]>
To: "Electric Vehicle Discussion List" <[email protected]>
Sent: Tuesday, October 09, 2007 8:40 AM
Subject: [EVDL] battery charging voltage


> I just want to verify the voltage I should be charging my flooded 6V
> batteries. In my research, it was around 2.48V per cell. Meaning around
> 15V for a 6V battery, and about 120V for my 16 6V batteries. Does this
> sound right? I also understand that the voltage should be increased in
> cold
> weather. So as the temperature is around 40 F as the low, I should adjust
> it up to around 2.8V per cell. They are basically new, having received
> them
> at the beginning of September.
>
> Also, out of curiousity, what is the voltage per cell that agms should be
> charged at?
>
> Thanks for all help.
>
> Brian
> _______________________________________________
> 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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70 Posts
Discussion Starter #4
Your voltage for the six volt battery should be about 7.44 not 15. I sugge=
st you contact the manufacturer of your battery they should have a recommen=
dation as to the best formula for charging the batteries.
Beano -- 1981 Ford Escort EV =

EValbum 1010Ted Sanders

> Date: Tue, 9 Oct 2007 10:40:17 -0400> From: [email protected]> =
To: [email protected]> Subject: [EVDL] battery charging voltage> > I just w=
ant to verify the voltage I should be charging my flooded 6V> batteries. In=
my research, it was around 2.48V per cell. Meaning around> 15V for a 6V ba=
ttery, and about 120V for my 16 6V batteries. Does this> sound right? I als=
o understand that the voltage should be increased in cold> weather. So as t=
he temperature is around 40 F as the low, I should adjust> it up to around =
2.8V per cell. They are basically new, having received them> at the beginni=
ng of September.> > Also, out of curiousity, what is the voltage per cell t=
hat agms should be> charged at?> > Thanks for all help.> > Brian> _________=
______________________________________> For subscription options, see> http=
://lists.sjsu.edu/mailman/listinfo/ev
_________________________________________________________________
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