The Home EV Charger
Install Playbook

Level 1 vs. Level 2: the real-world math

Every EV charger conversation starts with the wrong question — "how fast can it charge?" — instead of the right one: "how much charge do I actually use in a day, and how long is my car parked?" Work through this chapter before you spend a dollar, because for a lot of households the answer is "less charger than you think."

Level 1 is a regular 120-volt household outlet — the charger cord that comes with most EVs plugs right in. It delivers about 1.2–1.4 kW, which translates to roughly 3–5 miles of range per hour of charging. That sounds slow until you do the overnight math:

• Parked 10 hours overnight × ~4 miles/hour = ~40 miles of range added per night.
• The average American driver covers about 30–40 miles per day. If that's you, Level 1 replaces your daily use while you sleep — indefinitely.

Level 2 is a 240-volt circuit — the same voltage as an electric dryer or range — feeding a wall-mounted charger (technically an EVSE: electric vehicle supply equipment). Common sizes add range like this:

• 16 amps (3.8 kW): ~12–15 miles of range per hour
• 32 amps (7.7 kW): ~25–30 miles per hour
• 40 amps (9.6 kW): ~30–37 miles per hour
• 48 amps (11.5 kW): ~35–44 miles per hour — the practical ceiling for most home charging

Exact numbers vary by vehicle efficiency, temperature, and the car's onboard charger limit — your car can only accept what its onboard charger is rated for, no matter what the wall unit can deliver.

When Level 1 is genuinely enough: short commutes, a second car that mostly sits, plug-in hybrids with small batteries, and anyone whose daily miles stay under ~35. When Level 2 earns its cost: long commutes, shift work with quick turnarounds, two EVs sharing one parking spot, cold-climate range loss (batteries charge slower and deliver less in deep winter), and anyone planning to keep the car — and the house — for years.