Charging an electric car at home typically costs about €5 per 100 km (18 kWh at €0.28/kWh). The same distance in a petrol car burning 7 l/100 km costs around €12 — and consumes about 68 kWh of chemical energy, because roughly three-quarters of it leaves as heat. Public fast charging, at two to three times the home price per kWh, erases most of the advantage.
A petrol car pulls roughly 68 kWh out of the ground to cover 100 km; an electric one pulls 18 kWh out of the grid. 15,000 km a year in an EV is around 2,700 kWh — inside reach of a 3 kWp rooftop array. The same distance in petrol is about 10,000 kWh of liquid fuel you will never make at home. Energy content used: 1 litre of petrol = 9.7 kWh.
Multiply your car's consumption by your electricity price. A typical EV uses about 18 kWh per 100 km, so at €0.28/kWh that is roughly €5 per 100 km. Public fast charging usually costs two to three times more per kWh than charging at home.
Per kilometre, almost always yes on energy cost — but the reason is efficiency, not the price of electricity. A petrol engine turns about 25–30% of the fuel's energy into motion; an electric drivetrain manages 80–90%. A litre of petrol carries about 9.7 kWh, and most of it becomes heat.
Between 14 and 25 kWh per 100 km depending on the car, speed and weather. Small hatchbacks sit near 14–16; large SUVs and cold-weather highway driving push past 22.
About 9.7 kWh (roughly 34.8 MJ) of chemical energy. A 50-litre tank holds around 485 kWh — more energy than most home batteries store, which is why liquid fuel was hard to beat.
The same math as any EV. A Model 3 uses roughly 15 kWh per 100 km, so at €0.28/kWh home charging costs about €4.20 per 100 km. Public fast charging at €0.65/kWh pushes that to about €9.75 per 100 km.
If you drive daily, yes — keep it between 20% and 80% for routine use. If you drive occasionally, charge when needed instead of every night; fewer shallow cycles is easier on the battery.
Only if your tariff has time-of-use pricing. If you pay a flat rate, the kWh price is the same at 3 p.m. or 3 a.m. Check your utility bill or smart-meter app.