Definition : Maximum Power Point Tracking
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What does MPPT mean?

Maximum Power Point Tracking (MPPT) control is used in photovoltaic (PV) systems to maximize the PV array output power by tracking continuously the maximum power point (MPP). The maximum power point (MPP) of a solar module is the point along the I-V curve that corresponds to the maximum output power possible for the module. Due to the fluctuations in sunshine levels - the maximum point on any one day or at certain times in the day will also fluctuate. It is this fluctuation that can reduce the capacity of your solar energy panel. MPPT varies the ratio between the voltage and current delivered to the battery, in order to deliver maximum power. If there is excess voltage available from the PV, then it converts that to additional current to the battery.