[BLDG-SIM] effect of partial shading on PV performance

[Smita Gupta]

Hi,
 
A PV related query again. This time I would like to find out if anyone
can suggest an algorithm or tool that accounts for the effect of partial
shading on an array. From what I understand, EnergyPlus and eQuest
algorithms factor the effect of shading through adjusting the effective
irradiation incident on the surface to which the array is attached.
Please correct me if I am wrong in understanding this. 
 
But the effect of partial shading is quite different depending on the
location of the actual cell in series. The shaded cell depending on its
location in the series can degrade the performance a lot more than
proportional to the % of area shaded. Can anyone confirm if any tool or
algorithm takes into account his fact.
 
Any help and advise regarding this issue is appreciated.
 
Thank you,
 
 
 
PS-eQuest output for PV performance states that
"NOTE: PARTIAL SHADING OF A PV ARRAY CAN SEVERELY DEGRADE ITS
PERFORMANCE, BUT IS NOT TAKEN INTO ACCOUNT SEE REPORT LS-SH FOR SHADING
INFORMATION"
 
Smita Gupta
Energy Analyst, LEED AP
 
Buildings & Appliances Office
California Energy Commission
1516 Ninth St. MS-25
Sacramento, CA 95814
Phone: (916) 657-4034
Fax: (916) 654-4304




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