Integration with PVGIS 5.2

[giobetti]

This is just a note/food for thought not a direct integration request

I just came across this website by the EU, that allows to download EPW files for just about ANYWHERE in the world: https://re.jrc.ec.europa.eu/pvg_tools/en/#TMY

it also offers some API endpoints: https://joint-research-centre.ec.europa.eu/pvgis-photovoltaic-geographical-information-system/getting-started-pvgis/api-non-interactive-service_en

I am not sure about the quality of data, but it seems certainly interesting. I have tested a few weather files and they seem to work fine, only issues found are:

1. the location is not contained (is marked as unknown, unknown)
2. the cloud cover is expressed in percentage rather than in tenths.

screenshot of the interface 👇

[hansukyang]

Hi @giobetti - fyi, PVGIS is an excellent source. These reanalysis datasets represent the current state-of-art reconstruction of past weather, free from observation biases and consistent with laws of physics.

Climate One Building recently updated all their data files using ERA5 solar radiation data, which PVGIS also uses. In fact, it looks like PVGIS 5.2 is using ERA5-Land dataset (9km), which is higher resolution than ERA5 (~30km).

[giobetti]

Thanks for the comment. I haven’t looked into it enough, but my understanding is that those datasets can be very accurate for variables like temperature and radiation but not so for wind speed and direction. Do you have any info/thoughts on this?

Best, Giovanni

Sent from my iPhone

On 8. May 2022, at 01:41, Joseph Yang @.***> wrote:



Hi @giobettihttps://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fgiobetti&data=05%7C01%7C%7Ce047d076b0b54f285dcf08da3083204d%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637875636987503639%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=3TPklOogq1ISXj785phq48E4cxmvFzDLBbve9wxvxrE%3D&reserved=0 - fyi, PVGIS is an excellent source. These reanalysis datasets represent the current state-of-art reconstruction of past weather, free from observation biases and consistent with laws of physics.

Climate One Building recently updated all their data files using ERA5 solar radiation data, which PVGIS also uses. In fact, it looks like PVGIS 5.2 is using ERA5-Land dataset (9km), which is higher resolution than ERA5 (~30km).

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[hansukyang]

It really depends on the application because wind is heavily affected by topology but for the level of accuracy needed for building energy simulation I'm of the opinion that it's more or less sufficient (for a bit of a disclaimer, we provided the ERA5 data that Dru and Linda used to update Climate One Building files). One paper on ERA5 wind speed that I found is this:

• https://mdpi-res.com/d_attachment/energies/energies-14-04169/article_deploy/energies-14-04169-v3.pdf?version=1626325931

The paper basically mentions that for coastal regions and hilly areas the coarse model resolution (~30km) results in larger errors but works well in offshore wind and inland, which I think aligns with intuition.

Regards, Joseph

[phuongdoan13]

Per the discussion, de-scope for our project