The map shows the mean monthly values for global radiation in kWh/m². The higher the global radiation at the site, the better it is — basically — for the use of solar thermal or photovoltaic. However, other factors play a role, such as shading, angle of inclination of the selected area, statics e.g. when using systems on roof surfaces and much more.
The data comes from the radiation and climate measurement network of the German Weather Service from 1981 to 2010.
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FAQ
Frequently Asked Questions
Some basic informations about API Store ®.
Operation and development of APIs are currently fully funded by company Apitalks and its usage is for free.
Yes, you can.
All important information such as time of last update, license and other information are in response of each API call.
In case of major update that would not be compatible with previous version of API, we keep for 30 days both versions so you will have enough time to transfer to new version. We will inform you about the changes in advance by e-mail.