PuissPPV is a light tool to get a rough estimate of photovoltaic production.
Linux and Windows versions are available
This software has no pretention whatever to exactitude.
The Windows version comes in a zip archive enclosing all compulsory files.
The Linux version (tested under Ubuntu 18.04) comes as a .deb package you can install using Ubuntu software center.
More explanations come with the help file bundled with the software.