Bulk Charge: Constant current charging, providing the maximum current
to the battery until the battery voltage reaches the constant voltage stage
(boost charging voltage or equalize charging voltage).
Boost Charge: Constant voltage charging, the battery is charged for 120
minutes at an elevated charging voltage.
Float Charge: After the boost charge, the controller will reduce the battery
voltage by reducing the charging current, and let the battery voltage be
maintained at the set value of the float charging voltage. During the float
charging stage, the battery is charged very slightly to ensure that the battery
is maintained in a fully charged state. In the float charging stage, the load can
obtain nearly all solar power. If the load exceeds the power that solar energy
can provide, the controller will not be able to maintain the battery voltage at
the float charging stage. When the battery voltage is low to the set value of
boost charge return voltage, the system will exit the float charging stage and
enter the bulk charging stage again.
Lead-acid Battery Working Stage
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