
While power inverters could certainly prove to be useful, they're still a pretty new product on the market, and they're simply not advanced enough to replace outlet chargers yet. So, if you're looking for a nifty little gadget to give your car's battery a little boost now and then, a solar car battery charger could be a great option for you.
How much does it cost to charge an electric car with solar and without?
When you own an electric vehicle, every outlet is potentially a way to get a few more miles into your car’s batteries. Realistically, though, you’ll want to find a level 2 EV charger for home use, or the equivalent of a Tesla supercharger if you’re out on the road.
There are basically three ways to get the juice that’ll keep your car on the road: the grid, public charging stations, or your own solar panels.
The ongoing cost of fuel from the grid is whatever you currently pay for a kilowatt-hour (kWh). In the United States, that can be between about $.10 and $.40 depending on where you live, but the average is about $.13/kWh. For every kWh in your battery, you’ll get about 3-4 miles of range, so about 12 kWh will get you a 40-mile round trip every day, at an average cost of $1.56.
That’s how it looks now, but electricity prices rise like everything else, so next year, you might be paying 2 or 3% more for electricity, and over the lifetime of your car, prices could rise much higher. Over the next 25 years, your average cost for a kWh of grid power will be around 17 cents if electricity prices rise 2% per year and you live in a state where electricity is currently $.13/kWh.
At historical rates of energy cost increase, Californians will start out paying $662 per year to charge an EV, and end up paying over $1,000 per year within 20 years when using grid power.
Complicating matters just a bit is the concept of Time-of-Use billing (TOU), which means that electricity costs different amounts at different times of day. As an EV owner, you likely have the option of choosing a TOU plan and charging your car exclusively at night, when electricity is cheapest. TOU billing rates vary widely between states, with some overnight off-peak rates as low as $.07/kWh, while others such as SDG&E in California bottom out at $.29/kWh.
When you’re out in the world and need to top up the “tank,” you’re going to be looking for a public charging station to do it. To a certain extent, this is unavoidable if you own an EV, but you will save a lot of money if you can limit how often you do it.
Of course, there are free EV charging stations located all around the country, but for the most part, you’ll probably be paying for the electricity you need, and paying a lot, at that.
Prices for charging vary by location. For example, Tesla charging stations currently cost $.28/kWh for Tesla owners. Services like Blink are even more costly, with a minimum charge of $.39/kWh, and a maximum of $.69/kWh for fast charging. Between Tesla and Blink, those charges are anywhere from 2 to 5 times more expensive than home charging from the grid.