the temperature of shaded solar cell

[Chen]

Dear PVsyst team：

   when some solar cell is partial shaded，how to calculate its temperature as shown in the following figure, thanks! 

 

[André Mermoud]

In this tool, PVsyst tries to evaluate the temperature of the reverse-biased cell, as a function of the power consumed in this cell and the U-value (with resp. to 25° ambient).

In this case this is not dangerous, but in usual modules the cell temperature may become very high: this is the hot spot problem.   

[Chen]

just choose "Generic_Mono_700W_Half_Bifacial.PAN" for example. Here, Uc = 29 W/m²·k, or  say Uc = 29 W/m²·℃, and  the size of the cell is 150 mm*210 mm. 

For one solar cell shading, if the temperature rises by 1 ℃, it need power 0.21*0.15*29=  0.9135（W），and the cell power consumption  now is 45W，45/0.9135= 48.17 （℃），by adding 25 ° ambient，the result is 73.16（℃），which  is not quite consistent with the results shown on the graph （95℃）.Can you help me check if there are any errors in my deduction？ thanks

[Chen]

sorry ，i find a mistake in my sentence，the solar size is 210mm*105mm，so final result is 44/ ( 0.21*0.105*29) =25 = 94 （℃）.The results are basically the same as those of pvsyst.