Trojan Battery User Guide

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USER’S GUIDE
17
AGM / Gel Batteries
Similarly, two methods can be used to boost your AGM/gel product, automatically or manually. If using
the automatic method (charger is preprogrammed), just allow the charger to go through the complete
charge cycle. Make sure the proper battery type, AGM or gel, is selected on the charger.
If you use the manual method (charger has adjustable settings) follow the steps below:
î Boost charge at a CONSTANT VOLTAGE of (2.40 V/cell) with the current limited to 20% of C.
Example: 20 amps for a battery with a C of 100Ah.
î The time needed to boost charge the cells can be determined using the equation below.
Depth of discharge (DOD) can be determined using the information in Table 7.
Boost Charge Time in Hours =
+ 5 Hours
DOD X Capacity at 20Hr Rate
Maximum Charge Current
For example, a 100Ah battery taken down to a 25% depth of discharge (DOD) or 75% state of charge
(SOC) will need to be boost charged for 7½ hours with a 10A charger, or for 6¼ hours with a 20A charger.