Installation Manual

25
AGM BULK STAGE
The charger should deliver the initial current B until the voltage limit A is reached.
Absorption Stage - the charger should maintain the voltage A until the current
tapers to B. The initial charge current is recommended to be set at B = 0.25
X C20 (Imax = 0.35 X C20) in order to fully charge the batteries within a
reasonable amount of time. It can be set lower, however; please be aware that
charge time will increase so make sure the batteries have enough time to fully
charge before being put back into service. Rolls batteries have a low internal
resistance allowing them to be charged at a higher current, therefore, faster
than conventional flooded/wet batteries.
AGM FLOAT STAGE AND TERMINATION
The charger can maintain the current B indefinitely or until the charger is shut
off or unplugged. This stage is ideal to maintain battery state of charge. Make
sure the temperature compensation is programmed as specified in Figure
1 (-4mV/°C/cell or -2mV/°F/cell) or manually adjust the voltage setting for
temperatures varying from 25°C (77°F). As the temperature decreases, the
voltage should be increased and as the temperature increases the voltage
should be decreased. The profile in Figure 1 can be used with or without the
float stage. Without the float stage, recharge can be terminated based on time
(this will need to be determined as it will vary with depth of discharge and
charge current) or percentage recharge (105%-110%).
AGM CHARGE VOLTAGE QUICK REFERENCE
NOTE:
With the use of temperature compensation, be sure to set the charge
voltage at 2.45 volts per cell (VPC). Setting a higher or lower voltage on your
charger may cause incorrect adjustments in charge voltage.
If a temperature compensation sensor is not used, then you must manually
adjust charging voltages based on the battery temperature when in use, not
just ambient temperatures.