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www.enersys.com
Publication No. US-MP-OM-001
March 2017
17.2 Float Operation
In this type of operation, the battery and the critical load circuits are continuously connected
in parallel with a constant voltage charger. The charger should be capable of:
• charging the battery from the discharged condition while supplying the DC power to
the connected DC load
• providing the required constant float voltage
• providing voltage for equalizing the battery
If the batteries’ ambient temperature is outside the range of 68°F (20°C) to 80°F (27°C),
it is highly recommended that the battery be charged with a temperature compensated
charger with adjustment as stated in Table 17.1. If a temperature compensated charger is
not used, manual adjustments must be made according to Table 17.1.
TABLE 17.1
AVERAGE AMBIENT TEMPERATURE RECOMMENDED FLOAT VOLTAGE
˚F ˚C VOLTS PER CELL
25 -4 2.33
35 2 2.33
45 7 2.32
55 13 2.30
65 18 2.28
77 25 2.25
85 29 2.23
95 35 2.21
105 41 2.19
115 46 2.17
125 52 2.17
Float voltage sustains the battery in a fully charged condition and makes it available to
assume the emergency power requirements in the event of an AC power interruption or
charger failure.
Constant voltage output charging equipment is recommended. This type of charger, properly
adjusted to the recommended float voltages, and the following recommended surveillance
procedures will assist in obtaining consistent serviceability and optimum life.
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