Figure 1-3 Relationship between solar panel output characteristics and light
Figure 1-4 Relationship between solar panel output characteristics and temperature
1.5. Charging Stage Introductions
As one of the charging stages, MPPT cannot be used alone. It is usually required to
combine boost charge, floating charge, equalizing charge and other charging
methods to complete the battery charging process. A complete charging process
includes: Quick charge, holding charge and floating charge. Charging curve is
shown below:
Figure 1-5 Battery charging stages curve graph
a) Quick charge
In quick charge stage, the battery voltage has not yet reached the set value of full
charge voltage (i.e. equalizing/boost charge voltage) and the controller will perform
MPPT charging, which will provide maximum solar energy to charge the battery.
When the battery voltage reaches the pre-set value, constant voltage charge will
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