Hi @fabioluzo, Thank you for your interest in our products.
Your calculations are very thorough. However, please note that the power per unit area is calculated based on the area of the solar cells, not the total area of the solar panel. This may cause some discrepancies in the calculation results.
Hi, the efficiency for solar panel is calculated for all area of construction, not only the solar cell.
That’s the way you can find on brands like Canadian, Longi, Trina, etc. So, only for cells of course you can have a higher efficiency.
But we are talking about solar panel efficiency, as a whole, not only cells.
Please, look at this comparison on the Bluetti website (it’s in portuguese, but you can translate if needed): it says that the “Bluetti solar panel has a solar panel efficiency as 23.4%, while other brands has only 15%”:
Hi @fabioluzo, We have reconfirmed that the efficiency of the solar panel is indeed calculated based on the area of the solar cells themselves, and the frame and gaps should be excluded. This aligns with the consensus among all solar panel manufacturers.
As for the comparative efficiency, it is based on the test results of third-party samples we have procured.
Hi @BLUETTI_CARE , it’s not like this.
Just check any solar panel datasheet.
Example, for this one with datasheet attached here:
The 570W model, quite common on the market, calculating:
Area of the solar panel: 2.278 m x 1.134 m = 2.583 m²
570 W / 2.583 m² = 220.7 W/m².
Efficiency: 22.1%.
That’s the way it must be calculated. Makes no sense to use only the solar cell. The good quality, the best products have relation with the way they are built, reducing the area of frames and gaps.
Of-course that the solar cells of this solar panel from Canadian has a higher efficiency compared to 22.1%. But people use the solar panel as a whole, not just the solar cell.
Solar panels manufacturers do not advertise their solar cells efficiency, because that’s not the right way to do it.
The 23% Bluetti advertises is not fair for customers to properly evaluate it.
Hi @fabioluzo, Thank you for your attention and suggestions regarding this matter.
Our measurement methods comply with industry standards and local laws and regulations.
They may differ from the examples you mentioned, but this does not mean our data is without significance.
We have also forwarded your comments to our product manager for reference.
Hi @BLUETTI_CARE , my comments are related to the advertisement of Bluetti solar panels and efficiency.
Customers buy solar panels, not solar cells. So it’s not fair to advertise that the solar cell is so good if the final product, the solar panel, has a much lower efficiency based on total area.
It’s like if some car manufacturer advertises that the engine alone is better. However people buy cars, not engines alone. So the final product, the car, must be efficient, not so heavy, with overall mechanics that supports its quality. The engine alone itself is not enough to evaluate the car performance.
I hope you understand it. Of course Bluetti selects the best components, but what matters in the end is the final product.
Hi @fabioluzo, Yes, we understand your perspective, and we are also committed to providing more efficient products.
We have forwarded your comments to the R&D department. We believe we can develop solar panels with higher efficiency.
Thank you for your attention to our products.
