# PVsyst's forum

Welcome on PVsyst's forum.
 It is currently Mon Jun 21, 2021 2:09 pm

 All times are UTC+02:00

 Post new topic  Reply to topic Page 1 of 1 [ 3 posts ]
 Print view Previous topic | Next topic
Author Message
 Post subject: Weather station Solar Radiation to GlobIncPostPosted: Sat Jun 27, 2020 8:16 pm

Joined: Sat Nov 17, 2018 7:37 am
Posts: 5
Hello,
my weather station is reporting Solar Radiation every minute in W/m2.
I want to calculate daily & Monthly PR.
How do I use my W/m2 (resolution is in a minute) into the following formula (GlobInc)

PR = E_Grid / (GlobInc * Pnom)

Following what it looks from my weather station Solar Radiation sensor. (minute wise)

Top
 Post subject: Re: Weather station Solar Radiation to GlobIncPostPosted: Tue Jun 30, 2020 7:31 pm

Joined: Tue Oct 18, 2016 3:31 am
Posts: 361
Same procedure for daily and monthly calculation:
1. Get total energy output of plant for time period, Egrid (in kWh, MWh, etc)
2. Calculate hourly average of irradiance
3. Use basic calculation E_Grid/(Sum_of_hourly_POA*DC_Plant_Size)

Example:

Egrid = 4800 MWh
DC size = 2990 kW
Sum of hourly POA = 1940kWh/m^2

(4800*1000)/(2990*1940) = 82.7%

Top
 Post subject: Re: Weather station Solar Radiation to GlobIncPostPosted: Sat Aug 08, 2020 7:28 pm

Joined: Mon Apr 16, 2012 7:29 pm
Posts: 1686
If your original data are measured in the horizontal plane, for calculating the GlobInc, you have to use a transposition model.

You can use PVsyst for that.

- Import your Irradiances data file using "Databases > Import Meteo Data > Custom file". When you are here press F1 for the procedure.
NB: PVsyst only works in hourly values. During the import process, it will accumulate your minutes data into hourly values.
- In "Databases", open "Meteo Tables and Graphs".
Here you can see a table of all your data in hourly, daily or monthly values. You can get the values "Global tilted plane", which is indeed GlobInc or POA.

Top
 Display posts from previous: All posts1 day7 days2 weeks1 month3 months6 months1 year Sort by AuthorPost timeSubject AscendingDescending
 Post new topic  Reply to topic Page 1 of 1 [ 3 posts ]

 All times are UTC+02:00

 You cannot post new topics in this forumYou cannot reply to topics in this forumYou cannot edit your posts in this forumYou cannot delete your posts in this forumYou cannot post attachments in this forum

Search for:
 Jump to:  Select a forum ------------------ PVsyst SA Announcements (read only)    Latest news    PVsyst's forum rules FAQ (read only)    Installation and use of PVsyst    Meteo data    PV Components    Shadings and tracking    Simulations : parameters    Simulations : results    Standalone and pumping systems Your questions about PVsyst    Howto    Problems / Bugs    Meteo data    PV Components    Shadings and tracking    Simulations    Suggestions    Tutorials : Feedback and requests Links    PVsyst website    YouTube Channel