adrie
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Posts posted by adrie
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It is healthier to take a break from PVsyst once in a while. :)
See subject line. Inactivity time period is only 30-min or so. What's the purpose of this? Why can't the user stay logged into the PVsyst Forum indefinitely?
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It goes to DEMO mode. :cry:
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What happens after you dismiss the warnings?
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Ok, so PVsyst keeps the three copies of the SIT contents in sync with each other.
I guess ultimately I wanted to understand the reason for storing these SIT details three times. If they are simply always kept in sync, then it doesn't seem be done to address a user need. Perhaps it just made life easier for the program/programmer to do it this way? :)
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Thanks for responding!
Let's talk about the SIT file first, since that is what I was originally asking about. The other day I deleted one, and my simulation still ran. Is it right to conclude that it is no longer required?
This seems to contradict your observations though...
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This question has been unanswered for almost two years, but actually it would still be useful to have an answer...
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No, still waiting.
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The help file states:
A new file "Myproject_BatchParams_i.CSV" is created at each opening of the batch tool: you can never reuse a "MyProject_Params_i.CSV" file, except by copy/paste its parameters (but be careful with the matching of the columns with titles).What is the reason this file (or a copy of it) cannot be reused? What is so special about it?
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Yes, the Site file (*.SIT) and the meteo file (*.MET) are associated to the project when opening the project.
I'm not sure I fully understand what you mean by "associated". Does PVsyst detect when the information in the SIT and/or MET file is different from the PRJ file? Or do the SIT and MET file contents always get copied to the PRJ whenever the PRJ is opened? Is the PRJ information copy perhaps more of a back-up in case the SIT or MET file get lost?
Now if you have performed a simulation with a given site, the variant file (*.VCi) will store the values of this site as Input parameters of the already performed simulation.And if the variant is simulated again, will it use the data from the VCi file or from the changed SIT and MET?
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A copy of the SIT file contents appears to be stored in the PRJ file and in each VC# file.
Is the information in the PRJ file and/or the VC# files updated when the SIT file changes?
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This is normal. Months with higher yield influence the annual PR more strongly. If you want to check, just calculate a weighted average values of the monthly PR (weighted by kWh).
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Good question/suggestion. Any news?
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- How do I convert the coefficients, a and b, used in the Sandia thermal model to the U-values used in the PVsyst thermal balance model?
One way could be to plot the Sandia model over the temperature range of interest and do a regression fit with the PVsyst model.
Regarding the thermal balance equation: U · (Tcell - Tamb) = Alpha · Ginc · (1 - Effic):- Are U, Tamb, Alpha and Ginc the inputs of the above equation and Tcell and Effic are determined so as to satisfy the above equation?
For the purpose of the simualtion, Tcell is the unknown and all the others are given or estimated.
- In a previous post in this forum it was stated that U has a high uncertainty. How is this uncertainty implemented in the above equation? i.e. what is the relationship between the U used in the above equation and the U-values defined by the user.The U in the above equation is one of the given or estimated parameters. You could try a few different values to see how the simulation is affected by this uncertainty.
Thanks for your help!I hope it helped!
Physical model for power optimizers
in PV Components
Posted
The above statement is found in the optimizer documentation. I there any documentation of this model? How are the values of the model parameters determined?