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Hello, 1/ It is important that you have a multiple between the number of strings and number of MPPT inputs so that PVsyst can equally distribute the strings over the MPPTs, since there is no power sharing within the sub-array, only between the sub-arrays. 2/ I understand that your inverter has 12 MPPTs, some MPPTs with 2 strings and others with 1 strings, some with 18 panels in series and others with 19. You can either define each MPPT individually in separate sub-arrays: - 1st sub-array with 2 strings of 18 panels - 2nd the same - 3rd sub-array 1 string of 18 - etc. Or you can group all the MPPTs with the same configuration in the same sub-array, for instance: - 1st sub-array with 3 MPPTs with 6 strings of 18 - 2nd sub-array with 3 MPPTs and 3 strings of 18 (just to highlight here that it would not be correct to define 6 MPPTs with 9 strings of 18, since it would not be a multiple between the number of MPPTs and number of strings) - 3rd sub-array with 5 MPPTs with 5 strings of 19 - 4th sub-array with 1 MPPT with 2 strings of 19 If you have 11 inverters with the same configuration, you can multiply the number of MPPTs and the numbers of strings in each sub-array with 11 (33 MPPTs and 66 strings in the first sub-array etc.) I hope this clarifies the use of the Power sharing feature. You find more examples in the following youtube tutorial:

Hello, We are trying to model single axis trackers on different slopes: - from +5 to -5 degrees N-S - from +5 to -5 degrees E-W The 'axis tilt' value for trackers can be changed to model N-S slopes in an array of trackers in the 3D scene. However, when we do a message appears saying "tracker axis must be horizonal for PVsyst to model the bifacial gain". Is there no way around this currently? Secondly, there doesn't seem to be a method of inputting a E-W (tracker to tracker) slope for the array of trackers. Please could you point me in the right direction if there is a way of doing this? Kind regards, James.

Hi Dtarin, I try it and when I maximize again the window, the drawing area automatically shrink.

Reduce the size of the window then maximize again.

I guess it depends on whether you think the degradation rate is a positive or negative number. When I see "annual guaranteed lower limit diminution rate," I think in terms of the magnitude. I believe that the warrantee specifies the maximum amount of degradation you are supposed to see, not the minimum. The minimum would be 0% (least degradation). The graph also shows that the warranted degradation rate is the greatest (largest decrease), but the resulting efficiency is the lowest. Personally, I would buy the modules with the lowest degradation rate. [Maybe this would be clearer if the words "greater" and "lower" were used rather than "higher" and "lower," because the second pair of words implies a direction rather than the overall size of a change? Not sure.]

Kanagavel -- The degradation used is the average over each year. The important thing is that the warranty is not an absolute value, it is a degradation RATE. So if the warrantee is 0.5% per year, the degradation proceeds as follows: Year 1: 0% to 0.5%, average 0.25% Year 2: 0.5% to 1.0%, average 0.75% Year 3: 1.0% to 0.5%, average 1.25% By the end of each year, degradation has increased 0.5%, so the step from year to year is 0.5% or the warranted rate. Note that, as stated elsewhere, this form of degradation isn't the only one the plant undergoes. For example, module capacity mismatch increases as some modules degrade faster than others. This is accounted for separately in PVsyst.

Hi there, I am using PVsyst for some rooftop solar project designs. And here are my problems: 1/ Sharing power function. "The power sharing of the PVsyst model acts between sub-arrays, but not within a sub-array." I didn't understand it clearly. Could anyone explain it more? Thanks 2/ I have an old project. It used Sungrow SG125cx-p2 with a DC single-line diagram like the one below. My question is: How can I define this in the sub-array function? Because the old simulation looks incorrect. More info: DC/AC = 1.337. PV 580Wp. And I have 11 Inverters configured like this.

Dear Johnny, First of all, in a self-consumption + storage system, the system responds to the user's load. So, if you have a small load profile and a large PV system, excess energy will be injected into the grid. Since I don’t know your exact goal, I suggest creating multiple variants — starting with fewer PV modules, then trying with higher storage capacity. This will give you different results and help you find the best configuration. Regards,

Thank you, Muhammed Sarikaya.

Hello everyone. I'd have hard times using this software since I am new. I am designing a hybrid system with battery. I'd like to ask if how to properly design my system since I have only a daily demand of 313kWh and my PV system panel that is to be yield is 333kW per day. However, as I simulate my system for a year it has a lot of energy excess that is to be sent on the grid which is not ideal since my goal is that the PV should utilize the energy and the minimal excess must be on battery or to sale on grid.

Hello, Indeed, the first input of the Global horizontal irradiation is different between the two diagrams. Verify that you have the same coordinates and are using the same weather data provider.

To modifiy this parameter, you must go to the file in question then : "Additional Data" then "Secondary parameters" :

Hi all, I been learning to use Pvsyst, i recently try to compare my simulation with my friend. In the loss diagram i found that the Irradiation level for both are different. Any other setting or configuration i might need to look at given the location set point is the same.

Hi! The variable in the hourly energy variables are sometimes displayed with units "kW" instead of "kWh". This is indeed a bit confusing but for time step of one hour this is equivalent. The case of the apparent and reactive energy units should be unified with the rest in the future. In particular the reactive energy should be displayed by convention in kVARh instead of kVAh (even though they are all pseudo-units, equivalent to kW in the end).

Any response here ?

is the solution to "ungroup" the array and then set altitude per individual row?

Hi all. i have imported topo data and generated this shade scene of trackers. when i click "set auto altitude" at the highest point, the trackers do not properly follow the slope/topography. how can i fix this? less important question - the area with the highlighted streaks is always white space and i can only see the shade scene on the bottom left of my screen. why is that??

Hi, I have a display problem in 3D scene, I can only draw in a small area when I put the window in full screen. It's a bug or I have to configure it? Thanks in advance, Florent

I sent to you the file .zip with the project. Thank you

Dear Stewart, In the Near Shading tool, you need to draw your 3D scene manually — it is not generated automatically. I suggest watching our tutorial related to near shadings: Regards

Dear User, You can use PVsyst menu <File> <Export projects> to easily export your project files in a ZIP file and email it to our support address: support@pvsyst.com In the meantime, you can already read our FAQ about the most efficient way to optimize PVsyst simulation time: https://forum.pvsyst.com/topic/3542-how-to-optimize-simulation-time/?do=findComment&comment=9867 Best regards.

This is the last status before that I quite the simulation!

Hi Moderator, can you help me with the same problem? My simulation onVersione 8.0.8 is extremely slow. Can I send you the project? This is a big project but 2 hours for shadows and 4 hour for 15% of simulation are too much, so I stoped the simulation. Plese help me with a rewiev of the project. P.S. Where Can I share the project. Best regards and Thank you

Hello, I imported a SOLITEK module into the PVSYST database using the manufacturer's PAN file. After importing, PVSYST displays an error message: "Invalid PV module." "The specified temperature coefficient must be between -0.42%/°C and -0.15%/°C of VOC." How can I correct this temperature coefficient? Sincerely, Thomas Meurville

Hi, how I can plot my project after designing it in the system window and I want a 3d view of the plant align in what I design in the System window