Tesla Wall Connector Circuit Breaker & Wire Size

Free online tool • 2026 NEC Compliant

The Tesla Wall Connector (Generation 3) supports up to 48 amps of continuous charging current at 240V, delivering up to 11.5 kW. As a continuous load per NEC 625.42, it must be sized at 125%: 48A × 1.25 = 60A. This requires a 60-amp double-pole breaker and minimum 6 AWG copper wire. Check your panel capacity below.

Existing Loads in Your Panel

Check all loads currently connected to this panel.

Add any known existing circuit amps not listed above.

Panel Capacity Assessment

PANEL CAN SUPPORT
85.8Aof 160A usable capacity

Recommended EV Circuit

Breaker Size

40A

240V double-pole

Min Wire Size

8 AWG Cu

75°C rating

Charger Output

32A

continuous load

Panel usable capacity (80%)160A
Existing load demand (NEC 220.83)45.8A
EV charger circuit (NEC 625.42, 125%)40A
Remaining headroom74.2A

Panel can support this EV charger. Install a 40A double-pole breaker with 8 AWG Cu wire. Per NEC 625.42, EV chargers must be treated as continuous loads (sized at 125%).

NEC References: NEC 625.42 (EV as continuous load), NEC 625.40 (branch circuit requirements), NEC 220.83 (Optional Residential Load Calculation). This is an estimate — a licensed electrician should perform a complete load calculation before installation.

How to Use This Calculator

1

Select 200A or your panel size

Enter your main service panel amperage rating.

2

Select Level 2 — 48A charger

This matches the Tesla Wall Connector Gen 3 maximum.

3

Add existing loads

Check all major appliances in your home.

4

Review panel capacity

Confirm your panel has headroom for the 60A EV circuit.

Frequently Asked Questions

What breaker size does a Tesla Wall Connector need?

Tesla Wall Connector Gen 3 supports up to 48A, which requires a 60A double-pole 240V breaker (48A × 125% = 60A per NEC 625.42) and minimum 6 AWG copper wire.

Can I use a 50A breaker for a Tesla Wall Connector?

A 50A breaker limits the Wall Connector to a maximum of 40A output (50A × 80% = 40A). This is a valid configuration delivering about 9.6 kW of charging power, but you won't get the full 48A (11.5 kW) capability. You need a 60A breaker for maximum speed.

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