User manual

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• Charging current to the battery bank (Amp output) is low.
• Charging current will decrease as the batteries become fully charged. If charge
current is low the battery bank may have reached the end of the charge cycle.
Verify that the charger is nearing the end of Absorption time or in Float voltage
phase. Low current is normal this stage of charging.
• The battery bank self-regulates charge current. Voltage settings may be forced
(too high/low). However, Amp output to the battery bank cannot be forced and
will drop as the batteries reach 100% SOC. When the charge current reaches
the programmed End Amps/Return Amps/Tail Current set point (recommended
2% of the 20 Hr AH rate (C/20) capacity of a healthy Flooded battery bank)
for a 1-hour period the charge is complete. (Ex. 500 AH battery bank. Charge
current is reduced to 10 Amps). This set point may be programmed in the
charge controller to trigger Float charge if the battery bank reaches 100% SOC
before the Absorption Time has been completed.
• Test specific gravity.
– If specific gravity readings are at 1.250 or greater the batteries are nearing
completion or finished the Absorption charge phase.
– If the specific gravity is lower than 1.250 following a charge, perform a load
test to ensure all cells are operating correctly.
– Varying specific gravity readings may indicate a buildup of sulfation.
Perform a corrective Equalization to balance and desulfate and monitor
changes in specific gravity.
• When performing a corrective Equalization, the battery bank does not reach
Equalization voltage.
• Complete a full Bulk & Absorption charge prior to initiating an Equalization.
• Indicates the charge output may be too low. Verify the voltage and charge
output meet Rolls-recommended charging parameters for Flooded models.
• Indicates the possibility of a failed or dead cell which may be causing
resistance. Verify specific gravity of each cell and voltage reading for each
battery in the bank.