By EV Charge Cost Editorial Team. Published September 28, 2026, updated October 26, 2026.
The second EV in a household raises a practical question: do you need a second charger, a second circuit, or neither? The answer depends on combined daily miles, how long both cars are parked, and how much room your panel has.
How much energy two cars really need
At 13,500 miles a year each, two cars average 74 miles a day together, about 24.8 kWh for 33.5 kWh/100 mi EVs. The table compares the time to replace that at different setups.
| Combined miles/day | Energy | One shared 32 A circuit (7.68 kW total) | Two 32 A circuits (each car) | One shared 48 A circuit (11.52 kW total) |
|---|---|---|---|---|
| 60 | 20.1 kWh | 2 h 37 min | 1 h 19 min | 1 h 45 min |
| 80 | 26.8 kWh | 3 h 29 min | 1 h 45 min | 2 h 20 min |
| 120 | 40.2 kWh | 5 h 14 min | 2 h 37 min | 3 h 29 min |
| 160 | 53.6 kWh | 6 h 59 min | 3 h 29 min | 4 h 39 min |
Even the shared single circuit refills most two-car days overnight. Two circuits mainly help with very high mileage, short off-peak windows, or two large trucks. Mixed pairs matter too: a Tesla Model Y (26.9 kWh/100 mi) and a Chevrolet Silverado EV (49.6 kWh/100 mi) driving 37 miles each need 28.3 kWh, about 3 h 41 min on one 32 A circuit.
Four ways to set it up
1. Two chargers, two circuits
Each car gets its own full-speed circuit. Simplest to use, but it doubles the continuous load on your panel and is the setup most likely to need a panel or service upgrade.
2. Two chargers sharing one circuit
Many chargers support power sharing: two units on one circuit coordinate so their combined draw never exceeds the circuit's continuous limit. When both cars are plugged in, each gets part; when one finishes, the other gets all of it. This keeps panel load the same as one charger. It requires chargers designed to share, configured as the manufacturer specifies.
3. One charger, alternating
If both cars park within cable reach, you can charge one car one night and the other the next. At 32 A, one night of 8 hours adds about 183 miles, more than two days of average driving.
4. Level 2 plus Level 1
The low-mileage car uses a 120 V outlet (4 miles per hour, about 52 in 12 hours); the high-mileage car gets the Level 2 charger.
What it costs
Setup does not change the price per kWh; you pay for the energy both cars use. At 13,500 miles each:
- U.S. average (18.16¢/kWh): $136.88 a month, $1,642.58 a year
- Nevada (12.72¢/kWh): $95.88 a month
- Hawaii (47.18¢/kWh): $355.62 a month
Doubling the charging load can push some households into a higher price tier on tiered plans; see tiered rates and EV charging. A time-of-use plan rewards scheduling both cars overnight; see smart chargers and scheduling.
Plan for the next car, not just this one
Households often go from one EV to two within a few years. If you are installing the first charger now, a little planning avoids paying twice:
- Place the first charger where its cable can reach both parking spots.
- Ask your electrician whether the circuit and wire can later support a second, power-sharing unit.
- Choose a charger model that supports sharing if a second EV is likely.
- Remember that the car with the bigger onboard charger will finish first when power is shared; see onboard charger limits.
Checklist
- Add up both cars' longest regular days and their kWh/100 mi.
- Compare with the hours both cars are parked, and any off-peak window.
- Ask a licensed electrician for a load calculation before choosing two circuits vs sharing (see panel capacity).
- Check cable reach for both parking spots.
- Install under a local permit and follow the chargers' manufacturer instructions.