This is an important calculation to know, especially if you are installing a charging station at a public location and not planning to charge users a fee for its use. We gave a quick explanation of how much it costs to charge an EV, which is what each individual EV / hybrid driver is thinking, but if your a charging station host, you want to know what is the highest cost of electricity that you are going to have to spend to provide the service to drivers.
Let’s start with the worst case scenario and work our way down. There are 365 days in the year and 24 hours in a day means there are 8,760 hours in a year. If a level II charger pushes out 7 kw an hour and the utility charges $0.12 per kw, then thats $0.84 per hour of charging. If a car remains plugged in and charging for the full year the electric bill is going to come out to be $0.84 times 8,760 = $7,358.40.
In the very worst case scenario, where someone plugs their EV into the charging station for the entire year, 365 days out of the year, it’s going to cost a host property $613 a month. It should go without saying that this is almost impossible.
To get an idea of how much it would cost a host to provide charging services, lets think about this more logically. Most people who drive an EV or a hybrid, plug in their cars over night and leave home with a fully charged battery. If the average EV gets about 100 miles to the charge and cars owner drives the average of 50 miles a day, odds are pretty good, that when and if they stop at a station to top up, the most juice they’re going to need is about a quarter of a tank, or 25 miles worth of distance.
From the cost to charge explanation, to fully charge a Tesla is $10.20, a quarter battery charge is going to be $2.55. To fully charge a Nissan Leaf it’s $2.88 is going to be $0.72. So realistically speaking, if a station is used once a day for EV owners to top up their vehicles, at the most it will probably be about $2.55 times 30 = $76.50, and on the low end, $0.72 times 30 = $21.60.
If you’re the type who likes to budget and wants to know how much more you’re going to pay on your utility bill each month it’s probably safe to estimate, maybe $50.00 more.