Hello!

I made one solar plant with 1820 solar panels, each 450W. Total output 819kW with spec.annual yield 855,61 kwh/kwp. Grid feed in 700 955 kwh/year.

Then I changed all 1820 panels to 460W. Then total output was 837,20kW with spec.annual yield 831,37 kwh/kwp. Grid feed in 696 232 kwh/year.

My question - why the spec.annual yield and grid feed in drop off so much ? I am concerned because, the power of one module became bigger, but the spec. annual yield decreased.

 

Please see file attached.

Hello Karina Suharevska,

hard to tell without the project files. Might you be so kind and send me both project files via private message here in the forum so I can have a look into it?

Thank you in advance and kind regards,
Frederik

Hello!

I sent You both files in private messages.

Hello Karina Suharevska,

at first I thought that it might be rounding errors, but are you sure that you did send me the correct files? Even with minute values simulation I cannot reproduce your posted results:

A look into the PV System Energy Balance shows a difference in orientation and inclination, so it seems not only the modules have changed. The losses for low-light performance and DC/AC Conversion differ a lot.

My project files seem both be different from the ones where you did take the screenshots of. Might you be able to send the correct files?

Kind regards,
Frederik

Hello!

The screenshot files are incorrect. Please see screenshot below and use them for comparing.

These are correct screenshots. Inclination and orientation seems the same. I have question about:

1) Low-light performance - why with 460W panels its much bigger value than for 450W panels.

2) why spec.annual yield differs?

3) DC/AC conversion differs because of changing inverters?

 

Olimpia 9.5._1820gab.pdf Olimpia_8.9_450W.pdf