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MPPT solar controller refers to the solar controller with the function of "Maximum Power Point Tracking". The MPPT solar controller can detect the voltage and current of the solar panel in real time, and continuously track the maximum power (P=U*I), So that the system always charges the battery with the maximum power. The MPPT tracking efficiency is 99%, and the power generation efficiency of the whole system is as high as 97%. The battery charging stage is divided into MPPT charging, constant voltage equalizing charging and constant voltage floating charging.