No.
Name
No.
Name
○
Charging Indicator
○
Battery “-” Interface
○
Battery Indicator
○
Load “-” Interface
○
Load Indicator
○
Battery “+” Interface
○
Abnormality Indicator
○
Load “+” Interface
○
Liquid Crystal Display
○
External Temperature Sampling Interface
○
Operation Button
○
External Battery Voltage Sampling Interface
○
Mounting Hole
○
RS485 Communication Interface
○
Solar Panel “+” Interface
○
RS232 Communication Interface
○
Solar Panel “-” Interface
1.3 Introduction of the Maximum Power Point Tracking Technology
The Maximum Power Point Tracking (MPPT) system is an advanced charging technology that
enables solar panels to output more power by adjusting the working state of electrical modules. Due to
the nonlinearity of a solar array, there is a maximum energy output point (maximum power point) on the
curve of the array. Traditional solar charge controllers (switch charging technology and PWM charging
technology) cannot charge batteries at this point, thus unable to obtain the maximum energy of solar
panels. However, the solar energy charge controller equipped with the MPPT control technology can
track the maximum power point of a solar array at any time in order to gain maximum energy for battery
charging.
Take the 12V system for example. The peak voltage of solar panels (Vpp) is around 17V and
battery voltage is about 12V. Generally, when the solar charge controller is charging a battery, the
voltage of solar panel is maintained at about 12V, indicating that the maximum power is not used. MPPT
solar charge controllers provide a solution to that problem by constantly adjusting the input voltage and
current of solar panels, therefore maximizing input power.
Compared with conventional PWM solar charge controllers, MPPT solar charge controllers bring
out the maximum power of solar panels and provide greater charging current. Generally speaking, MPPT
solar charge controllers can improve energy utilization rate by 15% ~ 20% over PWM solar charge
controllers.
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