This simple PHP script is mostly for german owners of an own photovoltaics power system. The script is used to get readings of three electric meters handled by the middleware server from volkszaehler.org.
The configuration is done in the header of the script zaehlerwerte.php that is the three UUID values of the volume of the purchased electricity, as well as the solar power input, both from/to the electricity supplier, and finally the own solar power generation.
With help of those UUID the script asks the middleware server for the raw data at the specified date and calculates the own consumption from the solar power generation as well as the overall consumption.
The configuration of the URL of the middleware server depends on the used type of httpd server. The active configuration is plain php on port 8080 as well as the wrapper script zaehlerwerte.cgi and index.html for a simple thttpd.
Enjoy