2024 was the first full year that we have had solar power running at our house. We have sixteen 400 watt panels on our roof - eleven facing south, and five facing west. Combined, they are capable of generating up to 6.4 kWh, but this is rare since they don't all get direct sun at the same time. In 2024, the highest was 4.7 kWh on 23rd June, which was a very sunny day.
From the chart below for 23rd June you can see that we generated 37.84 kWh (green line) which covered almost all consumption during the day. 80% of what was generated was fed back to the grid for which we are paid €6.41. You can also see that there was very high consumption during the night - this was from charging my car. I don't charge during the day because we get approximately 19.5c/kWh for excess fed to grid, but are charged at night rates for 9.65c/kWh from 00:02 - 00:04, and 16.44c/kWh from 00:00-00.02 and 00:04 - 08:00. The consumption rate below is just under 8 kWh, or 64 kW for the night.
The total cost of charging the car was €9.43 approx. 64 kW should do just over 400 km in range in the summer - this equates to about €2.36/100 km. Compared to today's prices for petrol (€1.88/litre), and using a rate of 5 litres/100km, 100km in a petrol powered car would cost €9.40 - almost exactly four times the cost of my electric car. Charging at 02:00-00:40 only would bring my cost down further. Clear evidence that charging at home saves a lot of money!