Xantrex Freedom XC PRO Series Owner's Manual page 75

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.
Bulk Stage
Bulk charge is the first stage in the charging process and provides
the batteries with a controlled, constant current. Once the battery
voltage rises to the absorption voltage threshold, the charger
switches to the absorption stage.
Absorption Stage
During the absorption stage, the Freedom XC PRO begins
operating in constant voltage mode and the current falls gradually
as the amp hours are returned to the battery.
Table 11 Preset Absorption Voltage Settings
Battery Type Preset Absorption Voltage
Flooded 14.0V (Hot), 14.4V (Warm), 14.8V (Cold)
Gel 13.8V (Hot), 14.2V (Warm), 14.6V (Cold)
AGM 14.0V (Hot), 14.3V (Warm), 14.6V (Cold)
LFP 14.6
975-0799-01-01
Battery Type Preset Absorption Voltage
14.6 (default),
Custom
changeable between 12.0 to 18.0
The Freedom XC PRO transitions to the float stage if either one of
the following two conditions are met:
The charge current allowed by the batteries falls below the exit
current threshold, which is equal to 10% of the programmed
charge current and a minimum of 2A.
The Freedom XC PRO has been in absorption for the programmed
maximum absorption time limit. The default is 6 hours.
NOTE: If there are DC loads on the batteries, the charger's
current may never decrease to a level to initiate the next stage of
charging. In this case, the charger would stay in absorption until
the Absorb Time setting is reached.
Float Stage
Float charge maintains the batteries slightly above the self
discharge voltage of the batteries. The charge current in float is
the current necessary to maintain the batteries at the Float
Voltage setting, limited only by the inverter/charger's capability or
other settings that limit the inverter/charger's maximum charge
rate. Float charging reduces battery gassing, minimizes watering
requirements (for flooded batteries), and makes sure the batteries
are in a constant state of readiness. The charger automatically
switches to the float stage after the batteries have received a bulk
and absorption charge (see Float Stage). The batteries are
Operating in Grid Mode
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