Question

A 1.5 m² module has an STC power rating of 240 W. Calculate the efficiency of the module as a percentage

Answer 1

Answer:

The usable AC power from that panel will almost always be less than 300 Watts. The panel will generate 300 W if, as Craig Lawrence said, it is kept at 25 deg C and receives 1000 W/m2. Since the panel heats up as the sunlight hits it's surface (85% of that sunlight is not converted into electricity) its output will decrease (and specifically its voltage). For example if the panel reaches a temperature of 65 deg C - common occurrence if it's a hot summer day - the output of the panel will be reduced by ~20%, i.e. output of 240 W during peak sun hours. (Obviously, during a bright but cool winter day the situation may be better for the brief time that the sun is hitting the panel at the optimal angle.)

Your usable AC electrical power will be ~5-10% less than that since there will be additional losses in the conversion of DC to AC, ohmic losses, soiling losses, etc.

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Answer 2

Efficiency of the given panel = 160.

Explanation:

The efficiency of a solar panel depends on external factors like the weather and intensity of radiations, as well as the surface area of the panel and aperture area of the solar panel. So under STC (Standard Test Conditions), the power rating will differ for different surface area and aperture of the panel. This is the standard used to determine how many watts of power are produced in a square meter on earth. Temperature is also a factor in the output of a solar panel, so STC assumes less than 25 degrees Celsius.

So efficiency of the given panel = 240 / 1.5 = 160.