6
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
Charge
Voltage
Float
Voltage
2.55V 2.51V 2.47V 2.45V 2.43V 2.39V
2.38V 2.34V 2.30V 2.28V 2.26V 2.22V
15.30V 15.06V 14.82V 14.70V 14.58V 14.34V
14.25V 14.01V 13.77V 13.65V 13.53V 13.29V
30.60V 30.12V 29.64V 29.40V 29.16V 28.68V
28.50V 28.02V 27.54V 27.30V 27.06V 26.58V
61.20V 60.24V 59.28V 58.80V 58.32V 57.36V
57.00V 56.04V 55.08V 54.60V 54.12V 53.16V
32°F
(0°C)
50°F
(10°C)
68°F
(20°C)
77°F
(25°C)
86°F
(30°C)
104°F
(40°C)
Charge
Voltage
Float
Voltage
Charge
Voltage
Float
Voltage
Charge
Voltage
Float
Voltage
2V
12V
24V
48V
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