SamplexPower Pure Sine Wave PST-600-12 Manuel Du Propriétaire page 22

SECTION 7 |
TABLE 7.4: STATE OF CHARGE VERSUS STANDING VOLTAGE
Percentage of
Full Charge
100%
80%
70%
60%
20%
10%
0%
equalization. Please note that only the non-sealed / vented / fl ooded / wet cell batteries
are equalized. Do not equalize sealed / VRLA type of AGM or Gel Cell Batteries.
7.10 STATE OF DISCHARGE OF A LOADED BATTERY – LOW BATTERY /
DC INPUT VOLTAGE ALARM AND SHUTDOWN IN INVERTERS
Inverters are provided with a buzzer alarm to warn that the loaded battery has been
deeply discharged to around 80% of the rated capacity. Normally, the buzzer alarm is
triggered when the voltage at the DC input terminals of the inverter has dropped to
around 10.5V for a 12V battery or 21V for 24V battery at C-Rate discharge current of
C/5 Amps and electrolyte temp. of 80°F. The inverter is shut down if the terminal voltage
of the battery. The terminal voltage of the battery is dependent upon the following:
- Temperature of the battery electrolyte: Temperature of the electrolyte affects the
electrochemical reactions inside the battery and produces a Negative Voltage
Coeffi cient – during charging / discharging, the terminal voltage drops with rise in
temperature and rises with drop in temperature
- The amount of discharging current or "C-Rate": A battery has non linear internal
resistance and hence, as the discharge current increases, the battery terminal voltage
decreases non-linearly
22 | SAMLEX AMERICA INC.
General Information on Lead Acid
Batteries
Standing Voltage
of Individual Cells
2.10V
2.08V
2.02V
Standing Voltage of
12V Battery
12.6V
12.2V
12.1V
11.8V
11.7V
11.6V
Standing Voltage
of 24V Battery
24.60V
24.40V
24.20V