Storage; Delta-Q Charging Algorithms - US BATTERY US1800 XC2 User Manual

4
CHARGING AND
EQUALIZING
● Temperature sensors should be mounted on the side of the battery case in the
middle of the bank. Mount the sensor so that it remains below the liquid level en-
suring an accurate reading of cell temperature. Half way down the case is general-
ly sufficient.
DIAGRAM 8
Mounting Temperature Sensor
Sensor

4.7 DELTA-Q CHARGING ALGORITHMS

The following link will take you to a US Battery Technical Service Bulletin regarding the
appropriate Delta-Q charging algorithms for each battery:
26
Delta-Q Charging Algorithms
The following tips will help ensure that your batteries remain in good condition during

storage:

● Fully charge batteries before placing in storage.
● Store in a cool, dry location, protected from the elements.
● Disconnect from equipment to eliminate potential parasitic loads that may dis-
charge the battery.
● Batteries gradually self-discharge during storage. Monitor the specific gravity or
voltage every 4-6 weeks. Stored batteries should be given a boost charge when
they are at 80% state of charge (SOC) or less. Refer to Diagrams 9 and 10 for
specific gravity and voltage measurements for flooded/wet and AGM batteries re-
spectively.
● When batteries are taken out of storage, recharge before use.
● If put on float voltage there is no need for periodic boost
DIAGRAM 9
U.S. BATTERY FLOODED-LEAD ACID BATTERY
SELF-DISCHARGE RATE
Self-Discharge Rate
at 20ºF to 120ºF
100%
80%
60%
40%
20%
0%
0 30 60
Open Circuit Stand Time (days)
5
STORAGE
2.15
20ºF (-6.7ºC)
40ºF (4.4ºC)
2.07
60ºF (16ºC)
1.99
80ºF (27ºC)
1.91
100ºF (38ºC)
1.83
120ºF (49ºC)
1.75
90 120 150 180
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