Unused energy (grid limitation)

[Mickael BLEIN]

Dear PVSYST Support, 

I have a question about the grid limitation in PVSYST. Indeed, in my simulation, I put the grid limitation at 250 kVA this way with AC ohmic loss =3%

And the result is -5.8% of unused energy. It seems very huge and the impact on the productible is very strong. 

 

 

I did the same simulation with 0% Ohmic loss, and the result of unused energy is -0.1% 

 

How is calculated the Unused energy ? It seems that the more you have ohmic loss, the more you have Unused energy due to grid limitation. It's not logical for me. 

Do you have more informations about this please ? 

Thanks a lot 

Sincerely

Mickaël BLEIN 

[Robin Vincent]

Hi,

From the information you provided, this behavior does not seem normal indeed.

The 1st graph looks ok, having 5.8% losses due to the grid limitation with 320kVa installed and 250kVa  does not strike me as unusual.

The fact is has been lowered to almost nothing in the second case is strange. 

I tried to reproduce your test case, but the results I obtain are correct.

Please contact support@pvsyst.com and share your project so we can have a better look at what's happening.