Step 2 Current

Concept

Tmod Temperature module at ROC (°C)

• Obtain from Step 1 PV Device Temperature 

TSTC STC temperature = 25°C

fg Factor due to irradiance (decimal)

fclean Factor due to dirt (decimal)

fshade Factor due to dirt (decimal)

ISC Short circuit current at ROC

IPmax Current at maximum power at ROC

ISC STC Short circuit current at STC

IPmax STC Current at maximum power at STC

ftemp_Isc Factor due to temperature for short circuit current (decimal)

ftemp_Ipmax Factor due to temperature for current at maximum power (decimal)

αIsc Temperature coefficient for short circuit current (% C⁻¹)

αIpmax Temperature coefficient for current at maximum power (% C⁻¹)

• ⨯ Temperature coefficient for maximum power, γpmax

• Assume αIpmax = αIsc if not given

fmm Isc Factor due to current mismatch_short circuit current (decimal)

fmm Ipmax Factor due to current mismatch_current at maximum power (decimal)

Step 2.2 Calculate ftemp i

The formula is similar to ftemp_ave in Step 1 Choose PV Module  >> 1.4 Calculate ftemp_ave  

From Step 1 PV Device Temperature , Tmod = 68℃

Step 2.4 Calculate fclean

fclean = (100 % - Dirt Loss %) /100

Dirt loss value is subjective in real life, around 3%-5%

fckean = (100-1.5) / 100 = 0.985

Step 2.6 Calculate Current