What is the efficiency of the panel that is what fraction of the energy in sunlight is converted into energy?
A solar panel (an assemblage of solar cells) measures 58 cm X 53 cm. When facing the Sun, this panel generates 2.7 A at 14V. Sunlight delivers an energy of 1.0 X 10^3 W/m^2 to an area facing it. What is the efficiency of this panel, that is, what fraction of the energy in sunlight is converted into electric energy?
The area of the panel in square meters is 0.58 * 0.53, or 0.3074 sq. meter
If the power of the sunlight is 1000 watts per sq.meter, the panel receives
307.4 watts from the sun.
The panel puts out 2.7 amperes with a voltage of 14. The output power in watts
is the product of the voltage and current, 14 times 2.7, or 37.8 watts.
The efficiency is the ratio of power output to power input, so it is 37.8 / 307.4
or 0.1229 which can be expressed as 12.29 percent.
Solar cells aren’t all that efficient, unfortunately. Hope this answers your question.
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