Manual

20 | SAMLEX AMERICA INC. SAMLEX AMERICA INC. | 21
SECTION 7 | General Information on Batteries for
Powering Inverters


Inverters are normally 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 10.7V for a 12V battery or 21.4V for 24V battery at C-Rate dis-
charge current of C/5 Amps and electrolyte temp. of 78°C (by convention, battery data
is normally presented at 78°C).

-
nal 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


temperature and rises with drop in temperature
- The amount of discharging current or “C-Rate”:

decreases non-linearly





Low DC Input Voltage Alarm in Inverters








Terminal Voltage at 80% State



 10.45V 
  10.30V
  11.00V
 11.85V 11.50V
 12.15V 