Figure 2-1: Controller Structure Diagram
2.3 Functions
(1) Maximum Power Point Tracking technology
The controller uses Buck conversion circuit and MCU technology to track
the maximum power point to implement the maximum output power of solar
panels in different illumination intensity and temperature. The MPPT
algorithm increases efficiency of your PV system and decreases the
quantity of solar panels.
(2) Multi-stage Charge Control
The starting charging voltage of battery is different, the controller will use
the different charging strategies to finalize the charging process. When
starting charging voltage of battery is lower than 12.4V (for 12V battery),
battery will go through three stages as Bulk, Absorption and Float charging.
When starting charging voltage of battery is higher than 12.4V (for 12V
battery), battery will go through two stages as Bulk and Float charging.
Bulk Charge:
The controller charges the battery by its maximum output current. It is at
maximum power point tracking state at this phrase.
Absorption Charge:
The controller begins to limit the charging current to make the battery
voltage fixed at a settled absorption voltage (this voltage has temperature
compensation) for 2 hours. It increases the charging saturation level of
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