3) Float stage
After the battery is fully charged in the Absorption stage, the controller will reduces the battery
voltage to the setting point of Float voltage.
Once in Float stage, constant-voltage regulation is used to maintain battery voltage at setting point
of float voltage.
Float timeout
If the battery voltage remains lower than the Float voltage for 30 minutes, the controller will
return to Bulk charging stage.
Float cancel voltage
Once the battery voltage drops to setting point of Float cancel voltage, the controller also returns
to Bulk charging stage.
Float cancel voltage=Floating charging voltage -- (1V × battery numbers in series)
