What size breaker and how many amps do I need for a home EV charger?

Q: What size breaker and how many amps do I need for a home EV charger?

The circuit must be rated for 125% of what the charger draws, because EV charging is a continuous load under the National Electrical Code. That means a 32-amp charger on a 40-amp circuit, 40 amps on a 50-amp circuit and 48 amps on a 60-amp circuit. ChargePoint estimates 40 amps adds about 30 miles of range an hour and 48 amps about 36, and the Department of Energy notes that charging speed also depends on the car's built-in charger.

Updated October 25, 2026. Every answer lists the sources we read it from. If we couldn't back an answer, we left the question out.

Home wiring is a job for a licensed electrician. New circuits, outlets, transfer switches and battery connections must meet the National Electrical Code and your local rules, and many need a permit and inspection.

Charger setting, circuit and estimated range per hour (ChargePoint Home Flex table)
Charger draws	Circuit breaker	Range added per hour	Plug-in allowed
16 A	20 A	12 miles	No, hardwire
24 A	30 A	18 miles	No, hardwire
32 A	40 A	25 miles	Yes
40 A	50 A	30 miles	Yes
48 A	60 A	36 miles	No, hardwire

The Department of Energy notes most residential Level 2 chargers run at up to 30 amps and need a dedicated 40-amp circuit to meet NEC Article 625. If your panel has limited capacity, ChargePoint says a licensed electrician should pick the highest amperage it has room for; even 24 amps adds about 18 miles an hour, roughly 140 miles over 8 hours.

Run your own numbers: Charger installation cost

Sources

All 7 questions on ev charging at home · Every question we answer

Charger installation costState averages and what adds to the bill.

Estimates only. Your actual costs depend on your utility's rate plan, how and when you charge or use power, and local prices. This is general information, not financial, tax or legal advice. See our disclaimer.

Related questions

Keep going