By EV Charge Cost Editorial Team. Published October 4, 2026, updated October 26, 2026.
Most new EVs come with a portable Level 1 cord. Portable Level 2 units plug into a 240 V outlet instead and charge several times faster. Because they plug in rather than being hardwired, they can move with you — to a new home, a cabin or a relative’s garage.
How fast a portable charger is
Speed depends only on the outlet and the current setting, following the 80% continuous-load rule. For a typical EV using 33.5 kWh/100 mi:
| Outlet | Max continuous current | Power | Miles per hour | 8-hour night |
|---|---|---|---|---|
| 120 V household (NEMA 5-15) | 12 A | 1.44 kW | 4 | 34 mi |
| 240 V, 30 A (NEMA 14-30 / 10-30) | 24 A | 5.76 kW | 17 | 138 mi |
| 240 V, 40 A circuit | 32 A | 7.68 kW | 23 | 183 mi |
| 240 V, 50 A (NEMA 14-50) | 40 A | 9.60 kW | 29 | 229 mi |
Many portable Level 2 units let you choose the current, so the same charger can run safely on a smaller circuit. Always set it no higher than 80% of the breaker rating.
Portable vs wall-mounted Level 2
- Power. Plug-in units usually top out at 40 A on a 50 A outlet. Hardwired chargers can run at 48 A on a 60 A circuit, about 34 miles per hour for a typical EV — useful only if your car’s onboard charger accepts it.
- Outlet wear. Repeatedly plugging into an outlet wears it, and a cheap receptacle can overheat under hours of continuous load. Use a heavy-duty, properly installed outlet.
- GFCI. Newer electrical codes require ground-fault protection for many garage outlets, and some chargers can trip a GFCI breaker. Ask your electrician which setup suits your charger.
- Cost. Portable units often cost less, and if a suitable 240 V outlet already exists (for example, for a dryer or welder in the garage), there may be little installation cost. See EV charger installation cost.
Who should consider one
- Renters who cannot hardwire a charger but have, or can get, a 240 V outlet; see EV charging for renters.
- Owners who travel to places with RV-style 240 V outlets, such as campgrounds that offer NEMA 14-50 hookups.
- Households planning to move, since a plug-in charger leaves with you.
- Light drivers for whom the included 120 V cord already covers daily miles: they may not need any upgrade at all.
Safety checklist
- Buy a unit certified by a recognized safety lab (look for UL or ETL listing).
- Do not use ordinary extension cords or adapters that change the plug type without an electrician’s check; see extension cords and EV charging.
- Keep the control box off the ground and away from standing water.
- If the plug or outlet feels hot after charging, stop and have it inspected.
What it costs to charge
A portable charger does not change the price of the electricity: at 18.16¢/kWh a typical EV costs about $6.08 per 100 miles to charge at home, whatever the cable. A faster charger simply lets you fit charging into cheaper off-peak hours (time-of-use rates).