By choosing panels from the base, Trina Solar TSM-705NEG21C.20 Vertex N Bifacial 705 W, or Trina Solar TSM-705-NEG21C.20 VERTEX N 2024 705 W, which have identical characteristics, in an outdoor setting, I get large differences in production estimates. Why?

Hi Bruno Lalic,

the difference comes from the low light parameters:

left: "TSM-705NEG21C.20 Vertex N Bifacial 705 W"                                  right: "TSM-705-NEG21C.20 VERTEX N 2024 705 W"

 

In one case, the manufacturer has chosen the "standard low-light performance", which defaults to the two-diode-model for this module. In the other case, the manufacturer entered low light values himself, that is, defined values for voltage and current at 200 W/m². 

Hope that helps, kind regards,

Martin

 

Dear Brano Lalic,

We refer once again to your inquiry.

We created the data set for the TSM-705NEG21C.20 Vertex N Bifacial module ourselves at a customer's request. Later, the manufacturer created the data set for the TSM-705-NEG21C.20 VERTEX N 2024 module.

One difference between the data sets was the low-light performance. We had used the standard low-light performance, but have now adopted the low-light performance entered by the manufacturer.

Another difference was the incident angle modifier (IAM). We had assumed 95%, resulting in -4.19% losses due to reflection at the module surface. The manufacturer entered 100%, which we consider unrealistic. We have now adopted 99.9% in our data set.

Veliko hvala.

46 minutes ago, hotline_oh said:

Poštovani Brano Lalić,

Još jednom se osvrćemo na Vaš upit.

Skup podataka za TSM-705NEG21C.20 Vertex N Bifacijalni modul smo sami kreirali na zahtjev kupca. Kasnije je proizvođač kreirao skup podataka za TSM-705-NEG21C.20 VERTEX N 2024 modul.

Jedna razlika između skupova podataka su performanse u uslovima slabog osvjetljenja. Koristili smo standardne performanse u uslovima slabog osvjetljenja, ali sada smo usvojili performanse u uslovima slabog osvjetljenja koje je unio proizvođač.

Druga razlika je bio modifikator ugla upada (IAM). Pretpostavili smo 95%, što je rezultiralo gubicima od -4,19% zbog refleksije na površini modula. Proizvođač je unio 100%, što smatramo nerealnim. Sada smo u našem skupu podataka usvojili 99,9%.