Step 1 Collect Weather Data

1.2 Calculate Ck

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

Ck Power de-rate factor due to temperature (decimal)

γPmax Temperature coefficient for Maximum Power/ Rated Power/ Peak Power/ Power at MPP (Pmax) (% °C-1 or % K-1) 

Tmod,k Effective module temperature (°C)

Convert YPmax from <W °C-1> or <W K-1> to <% °C-1 > or <% K-1 > if need.

YPmax (% °C-1) = [ YPmax (W °C-1) / Pmax STC ] * 100 % 

Example

• SOLARMAN 200W

• YPmax = - 0.76 W °C-1

• YPmax = ( - 0.76 / 200 ) * 100 = -0.38 % °C-1

1.4 Calculate C‘k

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

C'k Temperature de-rating factor (decimal)