Introduction
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Two-Stage Battery Charging
The two-stage charging process includes the bulk and absorption stages, but uses a
“No Float” stage instead of “Float.” The relationship between charging current
and battery voltage during the two-stage charging process is shown in Figure 1-5.
No Float Stage
During the No Float stage the XW SCC does not produce any charge current.
Instead the XW SCC monitors the battery voltage and transitions back to the bulk
stage once the voltage drops below the ReCharge Volts setting for one minute.
Note: For more information about battery charging settings, see Table 3-2, “Battery
Menu Values” on page 3–6 and Table 3-3, “Custom Battery Menu Values” on page 3–8.
Figure 1-5
Two-Stage Battery Charging Cycle
Time
Float Stage
Absorption Stage
Bulk Stage
Absorption—
constant current
Absorption—
constant voltage
Current
Voltage
Time
Bulk/Absorption Voltage
ReCharge Voltage Threshold
Exit Current Threshold
Max Absorb Time—3 hours
(adjustable 2–6 hours)
Max Current Limit
Maximum 8 hours (fixed)
Float Voltage
Bulk Stage Absorption Stage
No Float Stage
Return to Bulk Stage
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