Hi,

 

I did a simulation using 620W Solar Panels with different brands, same capacity and inverter.

With JA Solar 620Wp, the PR of the system is at 81%. While with Panasonic 620Wp, the PR is at 86%. Please note that the datasheet of the 2 solar panel brands are very identical.

With these information, I can say that Panasonic is much more efficient panel than JA Solar. But, checking the datasheet they are very similar so I'm quite confuse how come I cannot reach or similar PR for both panels.

Could you please explain how PVSol simulate and forecast the yield?

 

Thank you.

Hi klb,

the reason why the modules perform differently is most likely their low light behavior. Even though the current and voltage values at STC might be very similar, the module's electricity output at lower light might vary strongly. The modules in the PV*SOL database are entered by the manufacturer, so they often input more detailed data that can't be found on the datasheet.

See more on that here:

https://help.valentin-software.com/pvsol/en/databases/components/pv-modules/

One important thing: We don't have Panasonic modules with 620 Wp in our database. I guess the PV module in your comparison must have come from you, a colleague of yours or from a third party project file that you opened. My guess is that the values in this unofficial dataset might be incorrect.

Best regards,

Martin

 

Hi Martin,

 

Both PAN files we used for the 2 panel brands came from JA Solar and Panasonic itself. 

I attached 2 files for your reference.

Having said that, if Panasonic has high PR compared to JA Solar, can we guarantee that we can get this PR in actual?

Thank you.

JAM66D45-620_LB.PAN AE13TD620THC16B5.pan

Hi klb,

Thank you for sending us the PAN files.

The modules have a different incident angle modifier (JA Solar 95%, Panasonic 100%). The JA Solar module has losses due to reflection on the module surface. The Panasonic module has (theoretically) no losses.