vilasgpacharne Posted July 2, 2020 Share Posted July 2, 2020 1. we are using bifacial solar module in one of our project.2. The module temperature ( of bifacial module) is being measured by CS240 temperaure sensor( make-compbell scientic) . This temperature sensor is fixed at back side of solar module.3. The module temperature ( of bifacial module) is also calucated by NREL method/ sandia module temperature model.We are finding large difference between these two values Difference= MOD_TEMP (Measured by CS240) - NREL_MOD_TEMP (Calculated-NREL method) this difference is i the range of -9% to 36% based on irradiance during the day.Request you to support to resolve below query 1. Why there is difference?2. is suitable to measure module temperature of bifacial solar module ( since it is fixed at only one side).3. What is suitable module temperature sensor to measure module temp of bifacial solar module so that the measured & calculated temperature(NREL) values should match.Regards,Vilas Pacharnevilasgpacharne@gmail.com Link to comment Share on other sites More sharing options...
André Mermoud Posted August 8, 2020 Share Posted August 8, 2020 The measurement of modules temperature in a field is a delicate operation. To my mind, just gluing the sensor on the backside of the module is not quite correct. The layout of the measurement is very important. Remember that a temperature sensor always measures its own temperature ! See our FAQ "How is evaluated the Module temperature during the simulation ? ".At the end of this post you have a paragraph with our advices: "PV array temperature measurement"Now PVsyst doesn't use the Sandia or NREL thermal model. It proposes a model in which you can adjust the "Thermal Loss factor" (U-value) in order to match you measurements at best. Please read the help "Project design > Array and system losses > Array Thermal losses".NB: expressing temperature differences in terms of percentages doesn't make sense. Percentage with respect to what ? If it is 0°C, this doesn't have a physical meaning. The reference could be anything else (25°C, -273°C, etc) The only way is to express the temperature differences in terms of °C. Link to comment Share on other sites More sharing options...
DirtyMuppet Posted January 19, 2021 Share Posted January 19, 2021 1. we are using bifacial solar module in one of our project.2. The module temperature ( of bifacial module) is being measured by CS240 temperaure sensor( make-compbell scientic) . This temperature sensor is fixed at back side of solar module.3. The module temperature ( of bifacial module) is also calucated by NREL method/ sandia module temperature model.We are finding large difference between these two values mcdvoice Difference= MOD_TEMP (Measured by CS240) - NREL_MOD_TEMP (Calculated-NREL method) this difference is i the range of -9% to 36% based on irradiance during the day.Request you to support to resolve below query 1. Why there is difference?2. is suitable to measure module temperature of bifacial solar module ( since it is fixed at only one side).3. What is suitable module temperature sensor to measure module temp of bifacial solar module so that the measured & calculated temperature(NREL) values should match. Your blog is simply amazing, congratulations on your great work! Link to comment Share on other sites More sharing options...
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