You have to take in your considerations many factors such as; the temperature of the panels, wind direction, humidity and dust over the pv panels, losses in DC cables. Otherwise, the efficiency calculations vary far away from actual values.

Good luck

Sultan Mohammad Alrowwad I have a panel and i have some sensore for diffrent parametre such as the temperature of the panel, humidity and radiation intensity .I want to have the efficiency of panel When the temperature of panel changing and i can measure the Voc and Isc of pv. i want to know how can i calculate the Output power in real time?

connect a resistive load to pv and measure all parameters including current and voltage using suitable data logger Fluke for example.

Sultan Mohammad Alrowwad

Yes, it seems to be using voltmeter and amper meter , by creating variable load and extracting the I-V graph can find Output power .thanks for your answer

If you know all the parameters that you mention, in principle I do not see why you should not be able to estimate the efficiency. This is a good reference (page 105): https://courses.edx.org/c4x/DelftX/ET.3034TU/asset/solar_energy_v1.1.pdf

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ПРОГНОЗУВАННЯ ЕФЕКТИВНОСТІ РОБОТИ ФОТОЕЛЕКТРИЧНИХ ПАНЕЛЕЙ У МІСТІ ЛЬВОВІ © Щур І.З., Климко В.І., 2014. Lviv Polytechnic National University Institutional Repository http://ena.lp.edu.ua

Dear respected Amirhossein Zabihi,

Yes, it is possible to determine the efficiency of the solar panel when parameters such as Isc (short circuit current), Voc (open circuit voltage), Vm (Voltage at maximum power point) and Im (Current at maximum power point) are known through measurement. The Vm and I m can be obtained from the I-V curve of solar panel. You can check my profile on the article: PERFORMANCE EVALUATION OF MONO-CRYSTALLINE PHOTOVOLTAIC PANELS IN FUNAAB, ALABATA, OGUN STATE, NIGERIA WEATHER CONDITION. It can be of help.

Best regards.

Kifilideen.

Dear Kifilideen Lekan Osanyinpeju

thank you for your answer.

Best regards

Hello,

To reach your consider formula, please read the attachments.

Best regards,

M. Firoozzadeh,

Jundi-Shapur university of Technology, Dezful, Iran