You say 2.15 volts per cell. That is 2.15 x 6 = 12.9 volts for a "12
volt" lead acid battery. That is the _incorrect_ voltage for charging a
12 volt battery. The battery would never reach 100% charge at that voltage.
You would want to charge to at least the "float" voltage of 13.2 volts.
The battery would eventually reach full charge at the float voltage. It
might take a long time, but it would get there.
According to the Trojan battery reference (that _you_ gave,) you have a
choice of a float voltage of 13.2 volts, or a "daily charge" of 14.8
volts, or an "equalize charge" of 15.5 volts.
The Trojan page you referenced is specific to _flooded_ lead acid
batteries however, rather than the sealed lead acid battery, either AGM
or perhaps "Gell Cell", that the fellow was originally asking advice
about. If that is indeed the fact (likely not, as a "gell cell" is
typically really a VRLA AGM these days,) then something between 13.2 to
14.4 would be the appropriate voltage, just as Lee Hart's battery page
says.
A real gell cell would foam the gelled electrolyte if you gave it an
"equalize" charge listed on the Trojan battery page, and that would be
the end of it.
Bill Dube'
On 1/12/2016 11:49 AM, dovepa via EV wrote:
There are things you can do to maximize life of the cells and the
manufactures have recommended voltage and current settings but they will charge
all the way up with anything above 2.15 volts.
I prefer to go to manufactures recommendations myself.
http://www.trojanbattery.com/tech-support/battery-maintenance/
Sent from my Verizon Wireless 4G LTE smartphone-------- Original message --------From: Bill
Dube via EV <ev@lists.evdl.org> Date: 1/12/2016 12:35 PM (GMT-06:00) To: Electric
Vehicle Discussion List <ev@lists.evdl.org> Subject: Re: [EVDL] Lead battery charging
to 13.2v
Paul,
It is not so simple.
As David suggests, it is best to read Lee Hart's battery charging basics:
http://www.evdl.org/pages/hartcharge.html
There is a _lot_ more to charging batteries than
you might think. Even Lee's "brief" tutorial
leaves quite a few of the subtleties out.
Bill D.
At 10:37 AM 1/12/2016, you wrote:
Lead acid cell voltage is 2.15 volts. 6 cells
make 12.9 volts. Anything above 12.9 will charge
it fully. Sent from my Verizon Wireless 4G LTE
smartphone-------- Original message
--------From: Robert Bruninga via EV
<ev@lists.evdl.org> Date: 1/12/2016 9:07
AM (GMT-06:00) To: Electric Vehicle Discussion
List <ev@lists.evdl.org> Subject: [EVDL] Lead
battery charging to 13.2v I put a gel cell on a
benchtop power supply and it charged overnight
to zero current at about 13.2v. So I upped it
to 13.8 to finish the charge and it basically
would not take cany more current. I always
thought the 13.8 and even 14v was the float
voltage and you had to at least get to that
voltage. I also remember that something like
13.2 is the highest one should go to provent any
gassing
Anyway, if one leaves a battery
overnight on 13.2v and it tapers to 0, is it
âfullâ. If so, what is 13.8 all
aboiut. Bob -------------- next part
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