array losses due to temperature

[inyss]

Hello everyone , I am new in pvsyst and I try to analyse loss  diagrame  

can someone please help me how to determine these 2 parameters : pv loss due to irradiance and pv loss due to temperature 

maths formula ? if you can 

 

many thanks in advance 

 

[Michele Oliosi]

Hi, I would recommend reading our help.
E.g. https://www.pvsyst.com/help/irradiance_loss.htm

These losses are the difference in PV production when calculating with a Module at STC conditions (1000W/m^2 and 25°), vs a module at incident irradiance and standard temperature (GlobInc & 25°), vs a module at incident irradiance and real temperature (GlobInc and TArray)

[inyss]

Thank you a lot , What I have understood is to :

• calclulate loss irradiation I should calculate : ( power at STC conditions - power ( globinc,25°))
• calclulate loss temperature I should calculate : ( power at STC conditions - power (globinc,Tarray))

than of course I will do pourcent

[Michele Oliosi]

Actually it should be

• calclulate loss irradiation I should calculate : ( power at STC conditions - power ( globinc,25°))
• calclulate loss temperature I should calculate : ( power ( globinc,25°) - power (globinc,Tarray))

 

[inyss]

On 12/12/2022 at 5:50 PM, Michele Oliosi said:

thanks a lot , now it is clear