What's the difference between Level 1 and Level 2 charging?
Speed. Level 1 plugs into a regular 120-volt outlet and charges slowly. Level 2 uses a 240-volt circuit, the kind an electric dryer is on. Twice the voltage and usually more current means several times the speed.
Level 1 often needs no new wiring if a good outlet near where you park has its own circuit (a dedicated circuit). The cord pulls about 12 amps, hour after hour, close to the limit for a standard 15-amp circuit. If that outlet shares a circuit, have an electrician look before you charge there every night.
Level 2 refills a normal day's driving overnight, with room to spare.
Which charger should I get?
Get one that fits your car's plug and carries a safety listing mark. For home charging, North America has 2 plugs. J1772 is what most non-Tesla EVs have come with. Tesla's plug, standardized as SAE J3400 and often called NACS, is where most automakers have said they're headed.
Tesla's Wall Connector is one Level 2 option. Plenty of others use J1772, and an adapter your carmaker supplies or approves lets most cars use either plug. If you might switch brands later, don't overthink the plug.
Should the charger be hardwired or plugged in?
Either works, and it mostly comes down to whether you're staying put. A plug-in charger uses a 240-volt outlet, often the RV-hookup kind (a NEMA 14-50), so it can move with you.
The outlet sets the ceiling. A 14-50 caps a plug-in charger at 40 amps, while many hardwired chargers can go to 48.
If you go plug-in, don't cheap out. Get an industrial-grade outlet. A bargain one can loosen and run hot under hours of charging. Newer code editions also require ground-fault protection (GFCI) on charging outlets. The tech doing the install will match it to your local code and charger, so it doesn't trip for no reason.
If you plan to stay, we'd go hardwired. You get room for the higher rate, and one less plug connection working hard all night.
Does my panel have room for an EV charger?
Many panels do. A licensed electrician's load calculation checks whether your panel and the power feed to your house (your service) can carry a charger too.
A Level 2 charger can run at full rating for hours, so the National Electrical Code treats it as a continuous load. Its circuit has to be rated for at least 125 percent of the charging current. That headroom keeps the wire and breaker from living at their limit. A charger set to 40 amps needs at least a 50-amp circuit. One set to 48 needs at least a 60.
If the numbers are tight, first ask whether the charger can be turned down. A lower rate usually still covers a normal day's driving by morning. Another option is a load management device, which turns the charger down while the dryer or AC runs. Otherwise, it's a panel or service upgrade, which also involves your power company, since it owns the meter.
Does the distance from the panel matter?
Yes, and it's one of the main things that sets the cost, because a longer run takes more thick wire. A panel in the garage is the simplest case.
A detached garage or a panel across the house means a longer run, maybe through the attic, the crawl space or underground. Finished walls take more work than an open garage wall.
Do I need a permit for an EV charger?
Usually, yes. Adding a 240-volt circuit takes an electrical permit and an inspection. In most of Tennessee, that goes through the State Fire Marshal's Office. Some local governments, like Metro Nashville, run their own, and the code edition can differ.
The inspection is a second set of eyes on a circuit that'll work hard for years.
Some utilities offer EV rates or rebates, though many in Middle Tennessee don't. A rebate may only cover certain chargers, so call yours before you buy.
What can I check before anyone comes out?
What we'll ask about first:
- Where your panel is, and how far from where you park.
- What's in between: finished walls, an attic, a crawl space or open ground.
- Your car's maximum home charging rate, from the owner's manual.
- Which big appliances are electric, not gas: water heater, dryer, range, heating.
- The number on the main breaker, like 100 or 200. That's a first read on your service size.
- A photo of the panel with its door open.
Skip the last 2 if the panel is hot, buzzing, wet, rusted or scorched, and tell us when you call.
That's where your part stops. Leave the inner metal cover (the dead front) on and the breakers in.