The cells area seems very low with respect to the module area

[Thomas Cros]

Hello,

My solar panel is 1480mm long by 670mm wide, area = 0.992m².

I have 72 half-cut cells, 156*78mm, cells area shoulb be 0.876m²

1st, the software do not let me choose cell H, it automatically compute it to 102, how is that ?

2nd, I got an error message, "The cells area seems very low with respect to the module area" regardless the cell W I type (I tried like 500mm).

I have several questions:

- how does the system calculate Cell H based on my cell W input?

- how does the system calculate cell area (isn't it supposed to be simply W*H in cm²)?

- why the system feedback to me cells area seems small regardless how large my cell W is?

Thank you in advance for your support.

[André Mermoud]

This tool in PVsyst is indeed a new feature, which tries to guess the cell sizes from available information like Sizes of the module, possible standard sizes of the cells, submodule partition, number of cells in series, etc.

Now your module is not quite standard. It has 4 cells in the width, therefore 2 x submodules. Therefore the number of diodes should be 2.  The configuration should be "In length" if you have indeed 72 cells in series (Vmpp around 40V), or "Twin Half-cut cells" if this has 2 x 36 cells (Vmpp around 20V) 

However this rather special configuration is not well treated in the present time. We will improve this in a next version.

 

[Thomas Cros]

On 2/17/2023 at 11:22 PM, André Mermoud said:

This tool in PVsyst is indeed a new feature, which tries to guess the cell sizes from available information like Sizes of the module, possible standard sizes of the cells, submodule partition, number of cells in series, etc.

Now your module is not quite standard. It has 4 cells in the width, therefore 2 x submodules. Therefore the number of diodes should be 2.  The configuration should be "In length" if you have indeed 72 cells in series (Vmpp around 40V), or "Twin Half-cut cells" if this has 2 x 36 cells (Vmpp around 20V) 

However this rather special configuration is not well treated in the present time. We will improve this in a next version.

 

Hello André,

Thank you for your answer.

I corrected the number of diodes to 2, it was a mistake.

Vmpp is 36.7V, I confirm that I have 72 cells in series and the configuration in length is correct.

Yes, it is not common but we still got demand on the market for this kind of module.
What I found surprising with this error is that whathever value I input for cell width (W), I still got the same error.

Find in attachment, the basic data + size and technology.

Edited February 20, 2023 by Thomas Cros