Bottom line: Wire size is not chosen from charger amperage alone. The correct conductor depends on breaker size, copper vs aluminum, temperature ratings, conduit fill, distance, installation method, and local code.
Quick recommendation#
| Decision point | Recommendation |
|---|---|
| Why there is no one-size wire answer | Wire selection depends on more than amps. Conductor material, insulation rating, conduit, ambient temperature, distance, voltage drop, terminals, and local code can all change the answer. |
| Distance and voltage drop | Longer runs can require larger conductors to reduce voltage drop and heat. A garage wall beside the panel is a very different job from a detached driveway location. |
| What to ask your electrician | Ask which conductor type they plan to use, why it matches the breaker and charger setting, whether conduit is included, and how the route affects cost. |
How to choose#
- Start with the electrical panel and parking location before choosing a charger.
- Match charger amperage to the circuit your electrician can safely install.
- Use smart scheduling when your utility offers time-of-use or EV-specific rates.
- Keep receipts, model numbers, permits, and installation records for rebates or tax paperwork.
Recommended next steps#
Run the charger finder, compare current top picks, and get an installation quote that documents circuit size, charger output, permits, and any panel work. If the installation is expensive, compare a lower-amperage setting or load-management option before approving a panel upgrade.