Considering installing a PV system?

[Marvin]

If you want to know what sort of amount of energy you could produce if you were to install PV then the PVGIS tool is a great start:

 

https://re.jrc.ec.europa.eu/pvg_tools/en/tools.html  

 

Comparing the PVGIS PV estimate to our PV results

 

Although December is not quite over, the PVGIS PV estimator seems to work well. However the inputs have to be accurate. We had to adjust the overall system loss down from 14% to 5% and think this is because inverters are much more efficient than they were.

 

Our meter used is, a proper meter, just before the energy connects to the grid. 

For our PV PVGIS estimates a year to year variance of 157kWh. We expect to end up about producing about 71kWh more in the year than the PVGIS calculation, so within tolerances.

Our PVGIS settings: Type ERA5 PV 5.12kW Loss 5% Roof added angle 22 degrees Azimuth +5

The graph shows the amount of kWhs per month, with about 200 being produced in January and 900 in June 2022