A Level 2 home EV charger needs a dedicated 240-volt circuit sized to the charger, a panel with enough spare capacity confirmed by a load calculation, and in most jurisdictions a permit and inspection. The circuit is sized at 125% of the charger's continuous load, so a 48-amp charger requires a 60-amp circuit.
Level 1 versus Level 2
Level 1 is the cord that came with the car plugged into a standard 120-volt outlet. It adds range slowly — overnight gets you a modest amount — but for a short commute it can be entirely adequate, and it costs nothing to set up. Plenty of households genuinely do not need more, and anyone who tells you otherwise before asking about your daily mileage is selling rather than advising.
Level 2 runs on 240 volts, the same as an electric dryer or range, and typically restores a full day's driving in a couple of hours. It needs a dedicated circuit run from the panel, and that is where the real work is.
The load calculation
This is the part people skip conceptually and electricians cannot skip legally. The question is not "are there two spare slots in the panel" — it is whether the service as a whole can carry the new load alongside everything already connected.
A standard calculation accounts for the square footage of the home, the fixed appliances (range, dryer, water heater, HVAC), and then the new continuous load of the charger. Two things make EV chargers demanding: they are large, and they run at full draw for hours, which is what "continuous" means. Code requires continuous loads to be sized at 125% of their rated current — so a 48-amp charger needs a 60-amp circuit, and a 40-amp charger needs 50 amps.
In a home with 200-amp service and gas heating, hot water and cooking, there is usually room. In a home with 100-amp service — common in older Colorado Springs neighbourhoods — or one that is already all-electric, there frequently is not.
If the panel cannot take it
There is more than one answer, and a service upgrade is not always the right one:
- Install a smaller charger. A 32-amp unit adds plenty of range overnight and may fit comfortably where a 48-amp unit does not. Most people charge while asleep; speed past a point is unused capacity.
- Load management. Devices that monitor total household draw and throttle or pause charging when the house is near capacity. These let a charger be installed where the raw calculation says no, and they are increasingly common.
- A branch circuit sharing device, which shares an existing 240V circuit — typically the dryer — between that appliance and the charger, so only one draws at a time.
- A panel or service upgrade. The definitive answer, and the right one if the panel is also old, undersized for the household generally, or has no remaining space. Worth doing properly if you are likely to add a heat pump later.
Hardwired or plug-in
Many Level 2 chargers can be installed either way. Plug-in units use a NEMA 14-50 receptacle, which makes the charger easy to replace or take with you. Hardwiring connects the unit directly to the circuit.
Hardwired is required above 48 amps, and it is generally the more robust choice for outdoor installations or anywhere the connection is exposed to weather and temperature swings. One point specific to plug-in installs: a 14-50 receptacle carrying a continuous 40-amp load for hours every night is working harder than the same receptacle serving an occasional range. Quality matters — inexpensive receptacles have a track record of overheating in exactly this application, and this is not the place to save a few dollars.
Placement
Decide this before the wire is run, because moving it afterwards means redoing the work:
- Where is the car's charge port, and which way will you park? Cable lengths are finite and a cable stretched across a parking space is a trip hazard.
- Will a second EV arrive later? Running conduit for a future circuit while the wall is open costs very little.
- Mount height — high enough that the cable is not on the floor, low enough to be convenient.
- Distance from the panel. Long runs need larger conductors to manage voltage drop, which raises cost.
- Outdoor installs need a weather-rated unit and enclosure, and in Colorado they also face large temperature swings and intense UV — mounting out of direct afternoon sun is worth doing.
- Detached garages are a separate project: a sub-panel and a buried feeder, which is substantially more work than a garage attached to the house.
Permits and inspection
EV charger installations require a permit in most jurisdictions, and that is a feature rather than an obstacle. An inspection confirms the circuit is correctly sized, the conductors are right for the load and distance, the equipment is properly grounded and the installation meets current code. Unpermitted electrical work can complicate an insurance claim and shows up during a home sale.
Local utility programmes and incentives change, so it is worth checking what is currently available before you start — rebates sometimes require that the work be permitted and performed by a licensed contractor anyway.
What the day looks like
Most straightforward installs are completed in a day: confirm the load calculation, run conduit and conductors from the panel to the location, install the breaker, mount and terminate the charger, test, then inspection. Complications that extend it are long runs through finished space, detached structures, and panels that turn out to need work first.
Smith handles EV charger installation, the panel work behind it when that is needed, and the permitting. Our EV charger buying guide covers selection in more detail, and if your home has aluminum branch wiring or an aging panel, that is worth resolving as part of the same conversation rather than building on top of it.
Frequently asked questions
What does a Level 2 EV charger installation require?
A dedicated 240-volt circuit run from the electrical panel, a breaker sized at 125% of the charger's continuous rating, conductors sized for the load and the distance, and in most jurisdictions a permit and inspection. A load calculation must confirm the existing service has capacity before any of that work begins.
Do I need to upgrade my electrical panel for an EV charger?
Not always. A load calculation determines it. Homes with 200-amp service and gas heating, hot water and cooking usually have room; homes with 100-amp service or all-electric appliances often do not. Where capacity is short, a smaller charger, a load management device or a circuit-sharing device can avoid a service upgrade.
Should an EV charger be hardwired or plug-in?
Hardwiring is required above 48 amps and is generally better outdoors or anywhere the connection is exposed to weather. Plug-in installs using a NEMA 14-50 receptacle make the charger easy to swap or take with you, but the receptacle carries a heavy continuous load nightly, so a quality device matters.
Do I need a permit to install an EV charger at home?
In most jurisdictions, yes. The inspection verifies the circuit is correctly sized for a continuous load, conductors suit the distance, and grounding and equipment meet current code. Unpermitted electrical work can complicate insurance claims and surface during a home sale, and some utility rebate programmes require permitted work.