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MPPT Solar Charge Controller Maximum Power Output Oct 31, 2017

MPPT Solar Charge Controller Maximum power output

The MPPT controller can detect the generation voltage of the solar panel in real time and track the maximum voltage and current value (VI), allowing the system to charge the battery with maximum power output. Used in solar photovoltaic systems, the coordination of solar panels, batteries, load the work, is the photovoltaic system of the brain.

Overview of MPPT

Maximum Power Point Tracking (MPPT) system is a by adjusting the working state of the electrical module, so that the photovoltaic panels can output more electrical power to the solar panels can be issued by the DC battery effectively stored in the battery , Can effectively solve the conventional power grid can not cover the remote areas and tourism areas of living and industrial electricity, does not produce environmental pollution.

The output power of the PV cell is related to the operating voltage of the MPPT controller. Only the most suitable voltage is applied and its output power will have a unique maximum value.

U = 30V, I = 0.9A; U = 36V, I = 0.7A; visible 30 voltage output power of the largest.

MPPT principle

To charge the battery, the output voltage of the solar panel must be higher than the current voltage of the battery. If the voltage of the solar panel is lower than the voltage of the battery, the output current will be close to zero. Therefore, for safety reasons, solar panels in the manufacture of the factory, the solar panel peak voltage (Vpp) about 17V or so, which is the ambient temperature of 25 ° C when the standard set. When the weather is very hot, the solar panel peak voltage Vpp will drop to about 15V, but in cold weather, the solar peak voltage Vpp can reach 18V.

Now, let's go back to the difference between the MPPT solar controller and the traditional solar controller. The traditional solar charge and discharge controller is a bit like a manual gearbox, when the engine speed increases, if the gearbox gear does not increase accordingly, it is bound to affect the speed. But for the MPPT solar controller, the charging parameters are set before the factory is set, that is, MPPT controller real-time tracking solar panels in the largest power point, to play the maximum effect of solar panels. The higher the voltage, the maximum power through the track, you can output more power, thereby enhancing the charging efficiency. In theory, the use of MPPT controller solar power generation system than the traditional efficiency by 50%, but according to our actual test, due to the surrounding environment and a variety of energy loss, the final efficiency can also be increased by 20% -30% The

In this sense, MPPT solar charge and discharge controller, is bound to eventually replace the traditional solar controller MPPT function

MPPT controller main function: to detect the main circuit DC voltage and output current, calculate the output power of solar arrays, and to achieve the maximum power point tracking. The perturbation resistor R and the MOSFET are connected together to change the average current through the resistor by changing the duty cycle of the MOSFET under the condition that the output voltage is substantially stable, resulting in a disturbance of the current. At the same time, the output current and voltage of the photovoltaic cell will also change, by measuring the disturbance before and after the photovoltaic cell output power and voltage changes to determine the next cycle of the perturbation direction, when the disturbance direction is correct when the solar energy output power increases, the next The cycle continues to disturb in the same direction, on the contrary, in the opposite direction of the disturbance, so repeated the disturbance and observation to make the solar photovoltaic output to the maximum power point.