www.enersys.com Publication No. US-RE-IOM-002 January 2012 Page 25
9.0 OPERATION
9.1 MPPT Charge Regulators
Recommended Inverter Settings:
Bulk (Absorb) Voltage: 2.40 VPC
Float Voltage: 2.25 VPC
Equalize Voltage: 2.67 VPC
Rebulk or Recharge Voltage: 2.08 VPC
Equalize charge should be done every 6 months for a minimum of 1 hour, maximum of 3 hours.
If possible, add water during the last 30 minutes of equalize charge. This helps ensure good
mixing of the electrolyte when the water is added.
9.1.1 ON/OFF Solar Charge Regulators
In order to ensure optimum recharge, the following setting charge disconnect and restart
voltages can be applied:
9.1.2 Low Voltage Disconnect
As a rule, installations will be equipped with a regulator whose voltage threshold values will
protect against deep discharge:
TABLE 9.1
TEMPERATURE
-20 to 0°C 0 to 20°C 20 to 35°C > 35°C
Low charge-restart
voltage (Vpc)
2.35V 2.30V 2.30V 2.25V
High charge-disconnect
voltage (Vpc)
2.50V 2.45V 2.40V 2.35V
TABLE 9.2
DISCHARGE TIME
10h 120h 240h
Low voltage alarm
1.92V 1.92V 1.95V
Disconnect
voltage
1.80V 1.85V 1.90V
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