Dometic Go Power! GP-SB-PWM-10 User Manual page 7

PRODUCT OVERVIEW
1.5 BATTERY CHARGING STAGES
The charge controller has a 4-stage battery charging algorithm for a rapid, efficient, and safe battery charging. These stages include: Bulk, Absorption,
Float, and Equalization. Visit gopowersolar.com/controllers to learn more about charging algorithms.
1.5.1 FIRST STAGE: BULK
This algorithm uses 100% of available solar power to recharge the battery and provides the maximum current available based on maximum input
current setting. In this stage the battery voltage has not yet reached constant voltage and the controller is delivering the maximum available current
to the batteries.
1.5.2 SECOND STAGE: ABSORPTION
When the battery reaches the constant voltage setpoint as indicated in the chart above, the controller will start to operate in constant voltage charging
mode, where it is no longer providing the maximum available current to the battery. The current will drop gradually to maintain the setpoint.
1.5.3 THIRD STAGE: FLOAT
After the Absorption stage, the controller reduces the current even further so that the battery voltage can reach and be maintained at a lower float
voltage set point.
1.5.4 FORTH STAGE: EQUALIZATION
Equalization is carried out every 30 days by default for flooded batteries or custom batteries if it is enabled. It is intentional overcharging of the
battery for a controlled time. 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 standard complement voltage, which gasifies the
battery electrolyte.
Check with your battery manufacturer to confirm your batteries require equalization.
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