Charging Recommendation for all Deep Cycle Batteries whose part number start with the letter "U" (this includes the following battery part numbers: U1800, U2000; U2200, U2300, U2400, U2500, U3050, U3050HC, UL-16, UL-16HC, U1450, U1850, U1850HC; U8VGC, U8VGCHC, USRM8V19, USRM8V-21, USRM8V-24, USRM8V-27; USRM8V-26, U-BIG-JOE; USRM-16TF, USRM-8D)
Voltage of the battery system
Charging Current
Bulk Charge Voltage
Absorption Voltage
Absorption Time in Hours
Float Voltage
Equalization Voltage
Equalization Time in hours
6
C / 10
7.2
7.75
2 to 4
6.6
7.8
2
8
C / 10
9.6
10.33
2 to 4
8.8
10.4
2
12
C / 10
14.4
15.5
2 to 4
13.2
15.6
2
24
C / 10
28.4
31
2 to 4
26.4
31.2
2
Need to determine the volts and amp-hours for your battery? See below
1. C = 20 hour capacity in Amp-hours
2. Float condition is for long term storage (several weeks).
3. Equalize every 4 to 8 weeks and always after a normal charge.
4. Be sure to leave the vent caps on your battery (or batteries) while charging them.
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Charging recommendation for the UAGM8D (rated at 250 AH at the 20-hour rate): |
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| Voltage of the battery system | Charging Current | Bulk Charge Voltage | Absorption Voltage | Absorption Time in Hours | Float Voltage | Equalization Voltage | Equalization Time in hours |
| 12 | C / 10 | 14.4 | 14.4 | 2 to 4 | 13.2 | 14.4 | 2 |
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| 1. C = 20 hour capacity in Amp-hours |
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2. Float condition is for long term storage (several weeks). 3. Equalize every 4 to 8 weeks and always after a normal charge. |
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Other Charging Notes/Tips/ Definitions: Typical phases on multi-stage chargers:
Temperature Compensation: Increase voltage by .028 volts per cell for every 10 degrees below 80 F. Decrease voltage by .028 volts per cell for every 10 degrees above 80F.
Bulk: Initial phase where the voltage builds and the most current is provided to the battery. This is typically where the maximum
current that the charger is capable of providing is supplied to the
battery. i.e. A 10 amp charger will provide at or near 10 amps during this phase.
Absorption: The phase where the voltage set point is held constant. Current will decrease gradually during this point as the battery internal resistance comes up.
Float: The maintenance or finishing phase of the charging cycle. Voltage is set at a minimum during this phase (usually 13.0c-13.5v) and current drops significantly. The battery should be nearly complete by the time this phase is reached.
An anti sulfation stage may be added where voltage spikes to high levels for very brief time periods for a set amount of time determined by the charger manufacturer, to convert the battery active material back to it's original state. Badly sulfated batteries will not usually respond to this charging regime and will need to be replaced.
