We have had solar panels installed on the roof of our house and are turning into complete nerds to see how much power we are generating, how much we are earning from surplus, and how green we are. We got 15 panels installed that are capable of generating up to five Kilowatts/hour when the sun is shining. The supplier estimates that we will generate between four and five thousand Kilowatts in a year. This will be a substantial part of our estimated seven thousand Kilowatts used in a year (this figure is very high, but about a third is from charging my car.)
Installation was very efficient and the system worked straight away. I have switched charging my car from night time to day time when it is sunny. I haven't worked out what the savings are from doing this. The screen shot below is taken at a time when it was sunny and most of what was being generated was being uploaded to the electricity grid. On a sunny day like this we should get about 5€ to 6€ per day - the recent good weather has been kind to us!
The next chart shows one day's overall output and consumption. Obviously nothing is happening when it is dark. The green line tells us what we were generating from the panels throughout the day. For the red line you can see at first that about 8 kw/h were being consumed when I plugged in my car. There's another red peak as we have now set out immersion heater to heat the water during the day. Charts like this are interesting as you can really see the difference solar power is already making. We estimate that it will have paid for itself in about 5 to 6 years.