Getting a 240-volt circuit installed for EV charging
This is the part of EV ownership that catches people out, because the charger is the cheap half. None of this depends on the Fathom — it is true for any EV, and it is worth sorting out before the truck arrives, because electricians book weeks ahead.
What decides the cost
Distance from your electrical panel to where the vehicle parks, more than anything else. It drives the wire gauge, the conduit, and the labour.
- Same wall as the panel, under 10 feet: roughly $200–$600
- 10 to 30 feet: roughly $400–$1,100
- 30 to 75 feet: roughly $800–$2,000
- Over 75 feet, or a detached garage: roughly $1,500–$4,500
A detached garage can need its own sub-panel or a trenched feeder, which is why that last band is so wide. Get two quotes for anything in it.
Whether your panel can take it
Look at the main breaker at the top of your panel. That number — commonly 100, 150, or 200 amps — is your service capacity.
Capacity is not the same as spare capacity. Your existing loads matter, and only a licensed electrician doing a load calculation can tell you what is genuinely available. A common conservative rule of thumb is that a new continuous circuit should not exceed roughly a quarter of service capacity without that calculation.
A 200-amp service typically supports a 60-amp charger circuit comfortably. A 100-amp service often does not support a 40-amp-plus charger without either a load calculation or a service upgrade — and a service upgrade is a serious expense.
If you are on a 100-amp panel, look specifically for a charger with dynamic load management. It monitors total household draw and throttles the car in real time, which can eliminate the need for a service upgrade entirely. That feature can be worth more than the price difference of the charger.
Hardwired or plug-in
A plug-in charger uses a receptacle, most commonly a NEMA 14-50. It is easier to replace, and you can take it with you when you move. Code caps a plug-in unit at 40 amps continuous on a 50-amp circuit.
A hardwired charger connects directly. It permits higher amperage — 48 amps on a 60-amp circuit — and some jurisdictions prefer it for outdoor installations.
One detail worth knowing: NEC requires GFCI protection on 240-volt receptacles in many locations, and there have been persistent nuisance-tripping complaints where an EVSE's own internal ground-fault protection interacts with a GFCI breaker. Hardwiring sidesteps that argument entirely.
Questions to ask the electrician
- Will you do a load calculation, and can I see it?
- Does this need a permit and an inspection in my jurisdiction? (Almost always yes.)
- What breaker size are you installing, and what continuous amperage does that support?
- Is the quote for the circuit only, or does it include mounting the charger?
- If I am close to my panel's limit, would load management be cheaper than a service upgrade?
Permits matter more than people expect. An unpermitted 240-volt circuit can create problems with insurance claims and at resale.
Common questions
How much does it cost to install a 240V outlet for an EV charger?
Typically $200 to $600 if the charger is on the same wall as your electrical panel, $400 to $1,100 for a 10 to 30 foot run, $800 to $2,000 for 30 to 75 feet, and $1,500 to $4,500 for longer runs or a detached garage. Distance from the panel is the dominant cost factor.
Can a 100 amp panel support an EV charger?
Sometimes, but often not at full speed. A 100-amp service frequently cannot support a 40-amp or larger charger without a load calculation, and may need a service upgrade. A charger with dynamic load management, which throttles charging based on total household demand, can often avoid that upgrade.
Do I need a permit to install an EV charger?
In almost all US jurisdictions, yes. A 240-volt circuit requires a permit and an inspection. Unpermitted electrical work can cause problems with insurance claims and at resale.
Should I get a hardwired or plug-in EV charger?
Plug-in units are easier to replace and can move with you, but are limited to 40 amps continuous. Hardwired units allow up to 48 amps on a 60-amp circuit and avoid GFCI nuisance-tripping issues that sometimes occur with plug-in installations.