[esp-r] PV generation, winter's power >> summer's?

[QIU]

Dear all,

I'm using the "integrated renewable model" to simulate PV generation.The result indicates that power generated in winter is unbelievably 4 times more than in summer. But obviously, direct plus diffuse radiation in summer is much bigger than in winter. 

So why that? everybody has similar experience? 

Thank you.

Regards,

Qiu