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MPPT Solar Charge Controllers

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MPPT stands for Maximum Power Point Tracking, and it relates to the solar cell itself.  Each solar cell has a point at which the current (I) and voltage (V) output from the cell result in the maximum power output of the cell.  In the diagram below the curve is an example of the standard output expected from a solar cell, the Maximum Power Point is at the position marked on the diagram. The principle is that if the output from the cell can be regulated to the voltage and current levels needed to achieve a power output at this point, then the power generated by the solar cell will be used most efficiently.