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MPPT Charging Technology and Stages
Float Charge Stage
The controller reduces the voltage to the floating stage, charging with a smaller voltage and current.
It will reduce the temperature of battery and prevent the gassing, also charging the battery slightly
at the same time. The purpose of Float stage is to offset the power consumption caused by self-
consumption and small loads in the whole system, while maintaining full battery storage capacity.
In Float stage, loads can continue to draw power from the battery. If the system load(s) exceed the
solar charge current, the controller will no longer be able to maintain the battery at the Float setpoint.
Should the battery voltage remains below the boost reconnect charging voltage, the controller will
exit Float stage and return to Bulk charging.
Equalize Charge Stage
Certain types of batteries benefit from periodic equalizing charge, which can stir the electrolyte, balance
battery voltage and complete chemical reaction. Equalizing charge increases the battery voltage, higher
than the nominal battery voltage, which gasifies the battery electrolyte. If it detects that the battery is
being over discharged, the solar controller will automatically turn the battery to equalization charging
stage, and the equalization charging will be 120mins. Equalizing charge and boost charge are not carried
out constantly in a full charge process to avoid too much gas precipitation or overheating of battery.
WARNING: Risk of explosion!
Equalizing flooded battery can produce explosive gases, so well ventilation of battery box
is necessary.
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CCD-0007727 Rev: 06-01-23
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