dtarin
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Posts posted by dtarin
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I calculated 1,253,579,619.69, which is a difference of 0.047%, possibly because your waterfall is only showing the first decimal. It can be displayed to third decimal.
1436079647 1431771408 -0.30% 1315797924 -8.10% 1315797924 0% 1322376914 0.50% 1309153144 -1% 1280351775 -2.20% 1272669665 -0.60% Total 1253579620 -1.50% PVsyst 1254163298 0.047% -
For a single year, σ = 3.11. For two consecutive years, σ = σ / √2
Var( X̄ ) = ( 1/n )^2 * Var( X₁ + X₂ + ... + Xₙ ) = ( 1/n )^2 * ( nσ² ) = σ² / n
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ShdLoss is the total near shading loss, which includes beam, circumsolar, diffuse and albedo components. FShdGl is the global shading loss factor, so 1- FShdGl will give the percentage value. If you wish to calculate from irradiance values, it is (GlobShd/GlobHrz - 1). If your model does not have horizon loss, GlobInc is the denominator.
If you want to identify direct (beam) shading (i.e., from a tree or module), you would use ShdBLss or FShdBm; FShdBm is typical. How to use it depends on your application. For example in capacity testing, it is often suggested to use below 1.0; however, this may not be the best option depending on your plant, which month(s) the test is occurring, etc.
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Your panels are placed with a 25 degree tilt and 0 azimuth onto a sloped terrain, resulting in an effective tilt and azimuth used in the simulation for calculations. This is typical.
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If you are not running specific PV software, such as AutoCAD plugin PVcase or something similar that can easily export from CAD, one way is to export the surface as a collection of points (X,Y,Z) in meters as a CSV file. They will need a screenshot from CAD of the surface and general site boundaries to align the modules within the parcel boundaries. In AutoCAD, the surface topographical lines can be exploded and exported as points easily, using the start or end points from the exploded lines which (in my experience) reduce down to a line segment with three points.
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It selects the lowest pitch automatically to avoid shadings. You can select any rack you want to change it or manually enter it in. Calculate a weighted average based on the number of tables at each pitch if they are different.
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As noted in title, PVsyst allows the user to run a simulation with according to strings selected and an electrical effect defined, but without having defined a partition in the shade scene. In prior versions I recall this creating an error or warning, and/or forcing the simulation back to linear when a partition was not defined.
The reason this is occurring is because as you can see in the screenshot, a higher GCR is selected and the site is practically flat; when this GCR is used for the backtracking algorithm, electrical loss is apparently 0% from shading due to adjacent tables. If I select a lower GCR to be used for backtracking, the simulation then forces the error and directs the user to define a partition. However, this should not be the case. If according to strings is selected, it should always force the user to define a partition, even if there is some internal check to see if there is shading from adjacent sheds (that's how it looks to me anyhow).
There are trees in the shade scene, so even if there is no shading due to tables, there should still be electrical effect loss, which is why according to strings should force the definition of a partition.
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Your GCR has increased in the new simulation, which will result in a lower transposition factor. In the shading scene under backtracking management, the pitch used for POA calculation and backtracking is selected, either automatically or specifically by user. POA (GlobInc) doesnt not consider shading losses, GlobEff does.
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3 hours ago, ShivamPandey said:
For 2P*26 table size, strung in U
4*1 i.e. 4 in the Y axis and 1 in X axisIt may depend on where these tables are in the array and the site conditions. For an exterior table that has significant tree shading (or other object shading), strung in U may be better (2x2). For interior tables, where most of the shading will be from the rows in front, stringing across the entire table (and not in U) is likely better (4x1).
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Change your settings in green box below.
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I think the minimum is two days, PVsyst wont let you simulate a single day.
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PR_ft*(DC_ft/DC_total) + PR_sat*(DC_sat/DC_total)
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You can take a weighted average of the PRs.
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Phi is the variable to change for this exercise. Phi_min = Phi_max in the batch parameter file to simulate a tracker at angle. Tilt and azimuth should not be changed.
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You cannot simulate SAT with fixed tilt. You need two separate variants. Yes, you can simulate MV and HV losses.
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If your site is that large (GWs I assume here), you're better off running them in separate variants. Also with a site that large, you may not need to model the entirety in the first place, as long as you have a scene that is representative of the overall site.
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It does not, trees are solid, static objects.
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If your trees are over the terrain, you can place them onto the terrain with any offset desired using edit > set auto altitude. If your terrain surface is limited, and you need to add trees that are outside the boundary, then you can manually adjust the edges of your terrain by moving points individually in the X, Y, or Z direction (you can select multiple at once, it is not restricted to a single point, in case previous statement was misleading). After the terrain surface is adjusted, use auto altitude on all objects.
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You need an image of the modules on terrain, and then import and scale the image into pvsyst. You can then visually align the modules imported from CAD and the ground topography from Sketchup to the imported image.
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Include GHI. Day 1 could be a cloudy day.
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This can all be done with batch simulation. Advanced simulation > Batch simulation. Prior to running the batch, set the output parameters under Output File, and make sure File name is checked under Output file. You don't need to give any specific name, just have this checked (you will define the output file name in the batch parameter file in the next step). Then proceed to Batch simulation to set the parameters and configure the batch file.
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Difference in the fields azimuth PVSyst versus PVCase
in How-to
Posted
If your trackers have any N-S tilt it will show tilted axis for the 3D scene. Horizontal axis is orientation type in Pvsyst. You would not want to change it to horiz. axis if your scene is 3D and you want to account for slopes in your tracker tables. Run (or re-run) the shading table, and it should update to tilted axis for Orient/System. You may need to go back into the orientation menu (to make sure it updates there and the tilt updates if it is non-zero average tilt) after generating the shading table , saving it, and exiting the shading menu for it to then update in the orientation menu.