Re: Battery capacity -- Next Day

I should add that the date stamp on the batteries are February and
March of this year.

Also I cannot at this time depend on my solar panels to fully recharge
the batteries with in a day. I am adding additional panels that will
bring the charging amps upto twelve amps. But I am only getting about
4-5 hours of charging time on a clear day. That is the reason I am
using the Vector smart charger for now until I get more panel capacity.


Larry


larry.greenwood@xxxxxxxxxxxxxxx wrote:
Thanks Bill, esp for the link to US batteries web page. Thats new to
me. I will follow up.

With everything I am seeing when recharging the batteries they seem to
be getting a full charge. The sp. g. test reads each cell at between
1.275 and 1.300 after a recharge, but the meter I use makes no further
breakdown between those two values. Durning the recharging process I
have notices voltages as high as 15 volts for a duration. But I have
not timed that precisely.

If the Vector Smart Charger will not fully recharge these batteries,
what will?

I have used the chargers "recondition" mode to desulfanate these
batteries. That process automatically cycles through in a 24 hour mode
and the batteries are bulbling but not profusely.

Larry



Bill Darden wrote:
On 2 Jun 2006 10:43:42 -0700, "larry.greenwood@xxxxxxxxxxxxxxx"
<lgreenwood@xxxxxxx> wrote:

Bill,

I have been going over all the postings from yesterday.

I have been using battery voltage under load to determine the
remaining capacity of the battery, ie., 12.25 volts = 50% capacity.
The table that I have reference illustrates that relationship this way:

12.75 100%
12.70 95
12.65 90
12.60 85
12.55 80
12.50 75
etc


My question is, are these figures (guidelines or estimates) or are they
precise?

Either way, would I use the load voltage or the voltage not under a
load for determining remaining battery capacity?

Larry

Hi Larry,

I believe that the 2200's you have from Interstate were actually
manufactured by U.S. Battery. You will find specific temperature
compensated charging information on their Web site on the Specs page,
http://www.usbattery.com/pages/usbspecs.htm. There is a good
possibility you are undercharging these batteries to begin with and
that is the reason you not obtaining the results you were expecting.

Also, most new deep cycle batteries require between 30 and 50
"preconditioning" cycles before they will achieve the manufacturer's
rated amp hour capacity. U.S. Battery has done a good job of
publishing the expected capacities at different discharge rates to
account for the Peukert Effect. I highly recommend you download their
amp hour and capacity pdf's and use the battery manufacturer's
recommended charging voltages and procedures, when available.
Finally, there is also the possibility that the batteries have some
accumulated sulfation since they were manufactured, especially if they
were not recharged by the dealer until you purchased them.

If you are applying the correct charging voltages can not fully
recover the batteries, ask your dealer to exchange them for some new
freshly manufactured ones. Lead-acid batteries are perishable.

Kindest regards,

BiLL......

.

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