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Battery Charging Reference
Charge Algorithm Stages
Three-Stage charging
If three-stage charging is enabled, the Freedom SW 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 or battery temperature
sensor)
• State of charge
The three automatic stages are:
• Bulk
• Absorption
• Float
See Figure 35 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 35 Three-Stage Battery Charging Cycle
FSW Owners Guide.book Page 77 Tuesday, August 7, 2018 9:03 AM
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