It ain't necessarily so.
Solar Cell I-V Characteristic
However, there is one particular combination of current and voltage for which the power reaches its maximum value, at Imp and Vmp. In other words, the point at which the cell generates maximum electrical power and this is shown at the top right area of the green rectangle. This is the “maximum power point” or MPP. Therefore the ideal operation of a photovoltaic cell (or panel) is defined to be at the maximum power point.
Also, once the panel is exposed to direct sunlight and starts generating power the temperature coefficient kicks in:
The effect of temperature on solar panel performance
Temperature has an effect the efficiency and maximum pv output of a solar panel. The hotter a panel gets, the less power it generates. The ambient temperature, temperature coefficient of the actual panel and the type of installation are all factors that affect the yield potential of a solar power system.
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