The short answer
Home charging is almost always cheaper, and dramatically cheaper than DC fast charging — you pay a premium for speed you do not need overnight. Per the US DOE, Level 2 adds approximately 25 miles of range per hour against 100 to 200+ miles per 30 minutes for DC fast charging, and that speed is priced in. Public Level 2 is sometimes free and sometimes above residential rates. The honest exception is a household that cannot install a charger at all, where public charging is not a comparison but the plan.
The arithmetic, on your own numbers
The comparison that matters is your residential rate against the specific networks near you. Both sides of that are local, which is why we give you the method rather than an average.
(kWh-per-100-miles / 0.9) x $-per-kWh
Run it once with your home rate and once with the network's
Use the all-in rate from your utility bill for home, and the network's posted per-kWh rate for public. Some networks bill per minute rather than per kWh, which makes a direct comparison harder and generally favors home further.
| Rate per kWh | Cost per 100 miles | Typically |
|---|---|---|
| $0.10 | $3.06 | A favorable residential or off-peak rate |
| $0.16 | $4.89 | A typical residential rate |
| $0.25 | $7.64 | A high residential rate, or public Level 2 |
| $0.35 | $10.69 | Public Level 2 in some territories |
| $0.48 | $14.67 | DC fast charging in some territories |
| $0.60 | $18.33 | DC fast charging at the higher end |
The pattern rather than the numbers is the point: the spread from a favorable off-peak home rate to higher-end DC fast charging is roughly six times. That is the gap home charging closes.
Why DC fast charging costs more
Not because the electricity is different. Because the infrastructure is: a DC fast charger is a large, expensive piece of equipment with a substantial grid connection, and in many territories the operator pays demand charges based on peak draw regardless of utilization. That cost is in the price.
What you are buying is speed — 100 to 200+ miles in 30 minutes per the US DOE. On a road trip that is exactly what you need. Overnight you have twelve hours, and paying a speed premium for it makes no sense.
Public Level 2 is a genuinely mixed picture
- Free public Level 2 exists — shopping centers, hotels, workplaces, some municipal parking. Where it is free and convenient, it beats home charging on cost by definition.
- Some public Level 2 is priced above residential rates, and some bills per hour rather than per kWh, which penalizes a car with a lower onboard charger rating.
- Session fees and idle fees can dominate the cost of a short top-up.
- Workplace charging is the best of both worlds where it exists, and is worth pushing for.
A per-minute tariff is worth understanding, because it interacts with your car's onboard limit. A car that accepts 48 A fills twice as fast as one accepting 32 A, so on a per-minute public charger the slower car pays twice as much for the same energy. Onboard limits by model.
What home charging costs to set up
The honest other side of the comparison. Home charging has a one-off cost that public charging does not.
| One-off | Ongoing | |
|---|---|---|
| Level 1 (the cordset in the car) | Nothing | Your residential rate |
| A portable Level 2 on an existing outlet | The charger | Your residential rate |
| A Level 2 install | The charger plus the circuit | Your residential rate, or an EV tariff |
| Public charging | Nothing | The network's rate, every time |
For most households the install pays back quickly against public charging, and the Level 1 row is worth noticing: it costs nothing at all and at approximately 5 miles of range per hour replaces around 60 miles overnight — enough for a lot of commutes. Level 1 vs Level 2.
When public charging is the plan, not the comparison
This is the case the cost comparison usually ignores, and it is a real one. If you rent with street parking, or live in a building that will not install chargers, home charging is not an option you are declining on cost grounds — it is unavailable.
In that situation the plan is deliberate rather than reactive:
- Workplace charging if it exists. The biggest single lever, and worth pushing for.
- Public Level 2 on a predictable weekly rhythm, rather than when the car gets low.
- DC fast charging as a backstop, not a routine — it is the most expensive electricity you will buy.
- A Level 1 cordset for any evening you can legitimately reach an outlet.
- Choose an efficient car. On constrained charging, a 26 kWh-per-100-mile sedan is a far easier vehicle to live with than a 65 kWh-per-100-mile truck. That decision matters more than any charger.
EV charging for renters and EV charging in an apartment cover the options properly.
What we would install
The two ends of the home charging decision
A full 48 A install for a household that can, and a portable that needs no installation for a household that cannot. Both beat routine DC fast charging on cost.
Most households, and anyone with a tight panel
Emporia Pro Level 2 EV Charger
The best-balanced 48 A charger for a typical US house: full 11.5 kW hardwired, and the only unit at this price that ships with a whole-home energy monitor so its load management is reading your actual panel rather than guessing.
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A renter with access to a 240 V outlet
EVDANCE Level 1 & 2 Portable EV Charger (16 A)
A dual-voltage 16 A cordset. On 240 V that is about 3.8 kW — roughly twice the Level 1 cordset that came with the car, from an outlet you may already be allowed to use.
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