The output of the solar cell module varies with the intensity of solar radiation and the temperature of the solar cell module itself (chip temperature). In addition, the solar cell module has the characteristic of voltage decreasing with the increase of current, so there is an optimal operating point to obtain the maximum power. The intensity of solar radiation varies, and obviously so does the optimal working point. Relative to these changes, the operating point of the solar cell module is always at the maximum power point, and the system always obtains the maximum power output from the solar cell module. This control is the maximum power tracking control. The most important feature of the inverter used in solar power system is that it includes the function of maximum power point tracking (MPPT).

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