Question text The Sunpower SPR-90 mono-crystalline module has the following elec

Question

Question text The Sunpower SPR-90 mono-crystalline module has the following electrical characteristics: (see photo in picture uploads)
If the cells in the module are operating at a temperature of 57C under global illumination of 0.87kW/m2 what is the power output of the module?

Assume that the output voltage is independent of illumination
Hint: use the power temperature co-efficient (why?)

Give your answer in Watts to 2 significant figures.
Note: Enter the numerical figure only. If any words are entered in the box, you will be awarded 0 and receive a penalty against your overall mark for this attempt.
Answer: ELECTRICAL CHARACTERISTICS AT STANDARD TEST CONDITIONS (STC) STC is defined as: irradiance of 1000W/m2, spectrum AM 1.5g and cell temperature of 25°C 90W Peak Power 2 Rated Voltage 17.7V Rated Current 5.1A. 21.2V Open Circuit Voltage Short Circuit Current 5.5A 15A Series Fuse Rating 12V Maximum System Voltage -0.38%/oc Power Temperature Co-efficients Voltage -60.8mV/oC Current 2.2mA/OC Module Efficiency 16.5%

Explanation / Answer

Solution : temperature Co-efficient for power =-0.38%/degree centigrade

therefore at 25 degree centigrade,

output power = 0.38* 25=9.5 watts

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