User manual

5
AGM Bulk Stage
The charger should deliver the initial current I1 until the voltage limit U0 is
reached. Absorption Stage - the charger should maintain the voltage U0 until
the current tapers to I1. The initial charge current is recommended to be set at
I1 = 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 I1 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
12 V
Battery
Charge
Voltage
Float
Voltage
15.30 15.06 14.82 14.70 14.58 14.34
14.25 14.01 13.77 13.65 13.53 13.29
32°F
(0°C)
50°F
(10°C)
68°F
(20°C)
77°F
(25°C)
86°F
(30°C)
104°F
(40°C)
Storage Temperature Refresh Charge Interval
Below 68°F (20°C) 9 Months
68°F (20°C) - 86°F (30°C) 6 Months
Higher than 86°F (30°C) 3 months