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Battery Charging Reference
This section describes the multistage charging algorithm (formula) of the Freedom SW.
Battery Types
Freedom SW charges flooded (or wet) lead-acid, Gel, AGM
(absorbed glass mat), and custom batteries.
• Flooded (or wet) batteries have removable battery caps for
refilling with distilled water and testing the electrolyte.
• Gel batteries have the electrolyte in the form of a gel rather
than a liquid and do not require topping up. Gel batteries are
sealed and the battery caps are not removable.
• AGM (Absorbed Glass Mat) batteries are similar to gel
batteries except that the electrolyte is absorbed into a fiberglass
matting.
• Custom battery is configured by the dealer, factory, or service
center for battery types other than those listed above.
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.
RISK OF BATTERY DAMAGE
Do not mix battery types. The Freedom SW can only select one battery
type setting for all batteries connected to its bank. All connected batteries
should either be: Flooded (or wet) or Gel or AGM or Custom.
Failure to follow these instructions can damage the unit and/or
damage other equipment.
Freedom SW 3K2K InvChg Owners Guide.book Page 63 Thursday, July 31, 2014 1:42 PM