I am working to recreate a PVsyst model for a site and use the model for weather normalization from the site's meteorological data. The original model was done in version 6.43. I am currently running version 6.75. When I get to the waterfall diagram, there are differences in the results for the Effective Irradiance on Collectors which I have not been able to replicate. I have read through the version changes posted in the PVsyst webpage but I cannot identify a change that would explain what I am seeing.
Here are the results in 6.75:
Input: 1624 kWh/m^2
Global Incident in coll. plane: +25.2%
Global incident below threshold: -0.1%
Near Shadings: irradiance loss: -3.1%
IAM factor on global: -1.3%
Soiling loss factor: -1.0%
In the version I am trying to replicate from 6.43:
Input: 1624 kWh/m^2
Global Incident in coll. plane: +29.4%
Global incident below threshold: None stated
Near Shadings: irradiance loss: -2.7%
IAM factor on global: -1.0%
Soiling loss factor: -1.0%
Any guidance on why these would be different and how to match the original model would be greatly appreciated.
Result differences across versions
in Problems / Bugs
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I am working to recreate a PVsyst model for a site and use the model for weather normalization from the site's meteorological data. The original model was done in version 6.43. I am currently running version 6.75. When I get to the waterfall diagram, there are differences in the results for the Effective Irradiance on Collectors which I have not been able to replicate. I have read through the version changes posted in the PVsyst webpage but I cannot identify a change that would explain what I am seeing.
Here are the results in 6.75:
Input: 1624 kWh/m^2
Global Incident in coll. plane: +25.2%
Global incident below threshold: -0.1%
Near Shadings: irradiance loss: -3.1%
IAM factor on global: -1.3%
Soiling loss factor: -1.0%
In the version I am trying to replicate from 6.43:
Input: 1624 kWh/m^2
Global Incident in coll. plane: +29.4%
Global incident below threshold: None stated
Near Shadings: irradiance loss: -2.7%
IAM factor on global: -1.0%
Soiling loss factor: -1.0%
Any guidance on why these would be different and how to match the original model would be greatly appreciated.