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20 | SAMLEX AMERICA INC.
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-





State of Charge (SOC) of a Battery – Based on “Standing Voltage”
The “Standing Voltage” of a battery under open circuit conditions (no load connected


and letting the battery “stand” idle for 3 to 8 hours before the voltage measurement



TABLE 7.4: STATE OF CHARGE VERSUS STANDING VOLTAGE – 12V BATTERY
Percentage of
Full Charge
Standing Voltage of 6 Cell,
12V Nominal Battery
Standing Voltage
of Individual Cells
100% 12.63V 2.105V
 12.6V 2.10V
80% 12.5V 2.08V
 12.3V 2.05V
60% 12.2V 2.03V
50% 12.1V 2.02V
40% 12.0V 2.00V
30% 11.8V 
20%  
10% 11.6V 
0%  


require equalization. Please note that only the non-sealed / vented / ooded / wet cell
batteries are equalized. Do not equalize sealed / VRLA type of AGM or Gel Cell Batteries.
State of Discharge of a loaded battery – Low Battery /
DC Input Voltage Alarm and Shutdown in Inverters


SECTION 7 | General Information on Batteries for
Powering Inverters