54
Freedom XC Owner’s Guide
Operating in Grid Mode
3-Stage Charging Algorithm
When enabled, the Freedom XC will charge batteries in a sequence
known as three-stage charging.
Whenever qualified AC power is
present at the inverter’s input, it passes power through to the
connected load and begins charging the batteries. The charging
voltage delivered to the battery depends on the battery’s:
•
Type setting
•
Temperature (by switch setting)
•
State of charge
The three automatic stages are:
•
Bulk
•
Absorption
•
Float
See Figure 12 for a graph of the three-stage charging profile.
There is a fourth stage, equalization, which is initialized manually
as it is only performed occasionally and only on flooded (or wet)
batteries.
The charging cycle is a multistage (three-stage) process. Whenever
qualified AC power is present at the inverter’s input, it passes power
through to the connected load and begins charging the batteries.
Figure 12
Three-Stage Battery Charging Cycle
Time
Time
Absorption Voltage
Float Voltage
Max Absorb Time - Default 6 hrs
Absorption E
Threshold = 10% charge current
and minimum of 2A
xit Current
3-Stage Charge
Float Stage
Absorption Stage
Bulk Stage
Battery
Current
Max Charge
Rate
Battery
Voltage
NOTE:
When the charge cycle is interrupted, the charger will restart charging at
the beginning of the multistage algorithm.
Charge current during equalize state (optional state not shown here) is
normally limited to 10A for 60 minutes.
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