[ausev] question about estimating charge level by voltage
gkrysztopik at satx.rr.com
Wed Oct 1 13:52:57 GMT 2008
the manual for my Deka's says wait 24 hours after charge or discharge to
determine SOC by voltage.
Open Circuit Voltage vs. State of Charge Comparison*
% Open Circuit Voltage Charge Flooded Gel AGM
100 12.60 or higher 12.85 or higher 12.80 or higher
75 12.40 12.65 12.60
50 12.20 12.35 12.30
25 12.00 12.00 12.00
0 11.80 11.80 11.80
NOTE: Divide values in half for 6-volt batteries.
* The “true” O.C.V. of a battery can only be determined after the battery
has been removed from the load (charge or discharge) for 24 hours.
Joby Wieser wrote:
> I understand that a fully charged lead acid pack is 2.15 volts per cell or for my 48 volt stack full charge is about 51.6 volts I also understand that when the voltage gets to the nominal voltage of 48 volts it is about 50% gone and it is time to recharge.
> What im not sure of is how long after applying load to the battries do you check the voltage to determine %charge left. For instance after driving all day the moment I stoped the voltage was 47.6, within a few minutes it was up to 49. Was I below 50% or in good shape?
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