11
·
Boost Charge
When the battery has recharged to the Boost voltage setpoint, constant- current regulation
is used to prevent heating and excessive battery gassing. The Boost stage remains 120
minutes and then goes to Float Charge.
·
Float Charge
After the battery is fully charged in Boost voltage stage, the controller reduces the battery
voltage to Float voltage set point. When the battery is fully recharged, there will be no
more chemical reactions and all the charge current transmits into heat and gas at this time.
Then 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. In the event that 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
charge.
·
Equalize Charge
WARNING: Risk of explosion!
Equalizing flooded battery
can produce explosive gases, so well
ventilation of battery box is necessary.
NOTE: Equipment damage!
Equalization may increase battery voltage to the level damaging to
sensitive DC loads. Ensure that all load allowable input voltages are
greater than the equalizing charging set point voltage.