The Database with Solar Resource Data for Different European Locations provides essential solar spectra datasets for modeling energy yield in photovoltaic systems. Accurate energy yield predictions rely on two key factors: first, a detailed understanding of the solar resource, which includes both irradiated power and its spectral composition (ideally divided into diffuse and direct components); and second, the behavior of solar modules under specific irradiation conditions, taking into account factors such as temperature and degradation. In this effort, spectral data from various sources have been collected.

Firstly, the database features solar spectra datasets measured at optimal installation angles, focusing on central Europe (Berlin) during 2020, 2021, and 2022. These datasets provide year-round measurements for the optimal installation angle of 35°. Spectrally resolved solar data was recorded every five minutes using two sets of spectrometers (MS-711 and MS-712), covering the wavelength range of 300–1700 nm. The merged data from these spectrometers is organized into yearly-segmented files., enabling in-depth analysis. It can be downloaded here:

• Merged data measured by MS-711 and 712 (300–1700 nm) during 2020 at 35° divided in three files: Jan to Mar; Apr to Jul; and Aug to Dec. (link to) 2020_S1+S2_35.zip

• Merged data measured by MS-711 and 712 (300–1700 nm) during 2021 at 35° divided in two files: Jan to Jun; Jul to Sep; and Oct to Dec. (link to) 2021_S1+S2_35.zip

• Merged data measured by MS-711 and 712 (300–1700 nm) during 2022 at 35° divided in three files: Jan to Apr; May to Oct; and Sep to Dec. (link to) 2022_S1+S2_35.zip

Further information and data at vertical orientation can be found in https://data.helmholtz-berlin.de/pub/ND000010

Additionally, it is possible to find data for other location at the Spectral Solar Radiation Data base Spectral Solar Radiation Data Base | Grid Modernization | NREL and NSRDB (nrel.gov) where spectral on demand data from the National Solar Resource Database (NSRDB) made publicly accessible by NREL was publised. The spectral on-demand data service provides solar irradiances on inclined PV panels for 2002 narrow-wavelength bands from 0.28 to 4.0 µm. Based on users’ selection of location, period of time, and PV system (fixed or one-axis PV system), a dedicated high-performance server located at NREL computes the spectral data in real time using the Fast All-sky Radiation Model for Solar applications with Narrowband Irradiances on Tilted surfaces (FARMS-NIT) and broadband and ancillary data served by the NSRDB. FARMS-NIT is an innovative radiative transfer model developed at NREL to efficiently and simultaneously calculate the spatial distribution of solar energy (radiances) in narrow-wavelength bands which are integrated over inclined PV panels to infer the plane-of-array (POA) irradiances.