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L09 E Production Analysis V18.1

The document provides instructions to calculate the expected performance of a grid-direct PV system given various parameters like the array wattage, inverter efficiency, soiling, voltage drops, cell temperature, and irradiance. It asks the reader to calculate the system derate factor, temperature and irradiance factors, total derate factor, and expected system output in AC watts.

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Wortenshire Oscar Weld
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47 views1 page

L09 E Production Analysis V18.1

The document provides instructions to calculate the expected performance of a grid-direct PV system given various parameters like the array wattage, inverter efficiency, soiling, voltage drops, cell temperature, and irradiance. It asks the reader to calculate the system derate factor, temperature and irradiance factors, total derate factor, and expected system output in AC watts.

Uploaded by

Wortenshire Oscar Weld
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Exercise: Production Analysis

Instructions: Calculate the expected performance of a grid-direct PV system given the parameters
and operating conditions below. Round all decimals to three places.

Roof mounted array: 12,000 W DC STC


System age: New
Inverter efficiency: 97.5%
Power tolerance ±3%
Soiling: 4%
DC voltage drop: 2%
AC voltage drop: 1%
Cell temperature: 55°C
Irradiance: 921 W/m2
Module temperature
coefficient of power (TkPmp): -0.41%/°C

Questions
1) Calculate the system derate factor that will be used in the performance calculation. Express
the answer as a decimal.

2) Calculate the temperature and irradiance factors that will be used in the performance
calculation. Express the answers as a decimal.

3) Calculate the total derate factor (including system, temperature, and irradiance).

4) Calculate the expected system output in AC watts.

© 2018 Solar Energy International

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