How to Prep Your Home for an EV Charger

by | Oct 25, 2022 | Battery Tips, EV Battery, How-tos | 0 comments

California has mandated that by 2035, sales of gas-burning passenger vehicles will be banned in the state. It’s expected that other states that follow California’s vehicle emissions standards will likely follow suit – places like Colorado, Maine, New York, and Washington. It’s driving the adoption of electric vehicles that are cleaner for the environment and less expensive to drive, but fueling these vehicles isn’t as easy as a five-minute fill-up at a gas station. Although fast-charging stations are popping up, another attraction for EVs is the option to charge your vehicle at home.

If you’re considering making the switch to an electric vehicle, one of the first things you’ll need to do is prep your home for an EV charger. While EV chargers can be purchased and installed relatively easily, there are a few things you’ll need to take into account before making the purchase.

How Home EV Charging Works

For most EVs, there are commonly three charging protocols that can be implemented to get your battery charged up. The first is a Level 1 charger—a 110/120-volt option which is a standard household plug. The second is a Level 2 charger— a 240V electrical supply that substantially lowers the time it takes to recharge the battery. And the third is fast charging is, of course, Level 3—a fast charging station typically at 400 volts with some up to 800 volts.

For home EV charging, you’ll be pulling power from a residential electrical service that’s not equipped to handle fast charging. It’ll be either a Level 1 or Level 2 charger used.

For Level 1 chargers, often no modifications are required to your home to plug in your car. It uses a normal household outlet, but it can take two days or longer to recharge a depleted battery from 20% to 80%, the recommended level for maximizing battery life.

For Level 2 EV home chargers, you’ll cut the charge time down to under 10 hours, in most cases, although that depends heavily on the charger you select and your available power. It will require electrical work to prep your home or garage.

Analyze Your Power Availability

The average home in the US has an electrical service to its panel of either 100 or 200 amps, and the difference can affect whether your home has the capacity to use an EV charger. An electrical load calculation should be used to determine if there’s enough capacity as is, or if the electrical service needs to be upgraded. As well, space on the panel is necessary for the breaker required for the charger.

A 100A service may have enough room to add a smaller Level 2 EV charger, perhaps at 16A or so. But if you’d like a faster charger, your local electric company may need to install a second service to your garage, running a cost of at least a few thousand dollars.

Depending on your home’s equipment and appliances, a 200A panel may have sufficient space for a larger EV charger, helping you get your battery topped up in much less time and with little infrastructure cost.

Select an EV Charger

The electric vehicle you’d like to own isn’t as much of a factor as it used to be in choosing a home charging station since most have adapters available to work with most or all charging protocols. What’s more important is the amount you’re willing to spend and the rate at which you’d like to charge.

For most manufacturers, you’ll find home EV chargers that range from 16A to 40A. An average 32-amp charger adds around 25 miles of range per hour it’s plugged in, up to 80%, and a somewhat slower rate for the final 20%. That’s often sufficient if you’re going to have your car plugged in overnight.

But if you’d like to maximize the lower energy costs at night, or if you need to charge the battery in a shorter time frame, or if you have more than one EV to charge up, a larger home EV station might be necessary. Options are now available for as high as 80 amps , cutting the charge time in less than half of a 32A charger.

As a rule of thumb, your charger should only use 80% of the electrical capacity available to avoid straining the electrical system. So, if your home has 50A available according to the load calculation, you shouldn’t exceed a 40A charger.  If 20A is remaining on your panel, a 16A charger maxes out its capacity.

Route an Outlet to the Charging Location

Next, you’ll need to make sure you have an appropriate outlet installed for your EV charger. EV chargers typically require a dedicated circuit, so you may need to have an electrician install a new outlet before you can use your EV charger.

Two common plug options that are used are NEMA 6-50 and NEMA 14-50. Commonly, welders use a NEMA 6-50 outlet, so there’s a remote possibility your garage is equipped with this plug already. NEMA 14-50 is commonly used for electric ranges in a kitchen or a clothes dryer. The difference between the two is that there’s no neutral wire on the NEMA 6-50 plug. Since the hot blades are spaced differently, they can’t be mistaken for each other.

Other chargers are hardwired to the panel rather than plugged into an outlet. It’s often the case for higher-capacity home EV chargers.

Your electrician will need to route a cable from your panel into the garage on its own circuit. Permits might be required, and working with high-current circuits is best left to the professionals. Make sure the outlet is central so the charging cable can reach your car easily.

Altogether, you can prep your home for an EV for next to nothing if you use a supplied 120V Level 1 charging cable with a standard household outlet, or it could be $5,000 or more if you’re installing a high-capacity charging station. Make sure you determine the available power before buying a new EV charger, then have it professionally installed. By taking these factors into account, you can be sure that you’re prepared to install an EV charger in your home.