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Efficiency = energy out as electricity / energy in as light

At full sun, there is approximately 1000W/m^2

Since your solar cell is not a square meter, you have to scale the answer.

Step 1 : Convert the Cell Area (mm sq.) to Meter Square

Step 2 : Divide the known wattage by the area M square

Example : If it is 156 mm x 156 mm Sq. Cell , then the Area would be : 0.24336 M. Sq

Now, if the Wattage is 3.86 Wp , then the efficiency would be 3.86 divided by 0.24336, = 15.86%

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