PV production data with ancillary PV and meteorological data including solar radiation measurements from FMI's outdoor solar laboratories in Helsinki, Kuopio and Sodankylä (Finland) starting from August 2015 and ending Dec 2021

The data is described in Karhu, J. A., A. V. Lindfors, W. Wandji Nyamsi, et al. 2026. " Photovoltaic Power and Meteorological Datasets With Snow Detection From the Outdoor Solar Power Laboratories of the Finnish Meteorological Institute." Geoscience Data Journal 13, no. 1: e70039. https://doi.org/10.1002/gdj3.70039.

PV power, ancillary and meteorological data for each PV system are organised in their respective, semicolon separated, csv-files with unique headers explaining the variables:

- FMI_Helsinki_PV.csv
- FMI_Kuopio_PV.csv
- FMI_Sodankyla_20deg_PV.csv
- FMI_Sodankyla_90deg_PV.csv

Below is an example how to read the datafiles to a pandas dataframe with python. Please note, that the lengths of the metadata header vary:
- Helsinki and Kuopio: 67
- Sodankylä: 93

###
import pandas as pd
dtype_dict = {'Remarks': str}
df = pd.read_csv('FMI_Sodankyla_20deg_PV.csv', sep=';', parse_dates=['utctime'], index_col=['utctime'], dtype=dtype_dict, header=93)
###

Daily plots of PV, meteorological and ancillary data are in system-specific tarballs:

- Helsinki_daily_plots.tar.gz
- Kuopio_daily_plots.tar.gz
- Sodankyla_20deg_daily_plots.tar.gz
- Sodankyla_90deg_daily_plots.tar.gz

Hourly photographs of the Sodankylä modules are in a tarball:

- Sodankyla_module_images_2018-2021.tar.gz

Metadata, additional photographs of the PV sites and their surroundings as well as data sheets and technical information of the modules and inverters can be found in a separate tarball:

- siteinfo_and_metadata.tar.gz