User Guide

19
USER’S GUIDE
19
î In applications where batteries are infrequently used, it is desirable to compensate for
self-discharge by keeping a low charging voltage on the batteries. This is called the oat voltage.
Avoid using continuous oat charging on VRLA batteries that are charged more than once/month.
When oat charging is used, it is started immediately after the end of the nish stage.
î VRLA charging voltages should always be temperature compensated per Table 6.
Table 6
Valve Regulated Batteries - Normal Charging Parameters @ 77°F (25°C)
Trojan Battery
Line
Maximum
Charge Current*
(% of C
20
)
Absorption
Voltage**
(V/cell)
Maximum
Absorption Phase
Time (hours)
Finish Current
(% of C
20
)
Equalization
Voltage
(V/cell)
Float Voltage
(V/cell)
Temperature
Compensation
(V/cell)
AGM 20%
2.40 2 - N/A 2.25
Fahrenheit:
-2.8 mV x
(T
battery
-77)
Celsius:
-5 mV x
(T
battery
-25)
Gel 13%
*If charging time is limited, contact Trojan Technical Support for assistance.
**In cases where the charger has a bulk voltage setting rather than a current, use the above absorption settings.
Figure 7
Recommended Trojan Deep-Cycle AGM Charging Prole
Note: Charging time will vary depending on battery size, charger output, and depth of discharge.
Voltage
(per cell)
Current
(Amps)
2.40V
(@77°F, 25°C)
Charge Current
Charge Voltage
20% 80%
100%
State of Charge (%)
Approximately
C
20
/200
Will increase
with age
20% C
20