1. The maximum power point (MPP) is the point on the current-voltage (I-V) curve of a solar module under illumination, where the product of current and voltage is maximum (Pmax, measured in watts). The points on the I and V scales which describe this curve point are named Imp (current at maximum power) and Vmp (voltage at maximum power.)
2. In photovoltaic systems, the point at which the most possible current is drawn from a cell, and the voltage subsequently drops off. The MPP changes slightly with temperature and intensity of sunlight.
PV, Solar Cell
http://www.daviddarling.info/encyclopedia/M/AE_maximum_power_point.html (1.); http://www.dictionaryofconstruction.com/definition/maximum-power-point-mpp.html (2.)
Author: Alexander Kravchik