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EV Panel Upgrade Check

Does the charger fit your 100A or 200A service?

Inputs

Inputs and assumptions

Largest coincident load per NEC 220 demand method. Negative headroom means a service upgrade or load management is needed.

Planned charger.

Main breaker: 100 or 200.

Result

Remaining headroom
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Service capacity
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Total with charger
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What to check

  • Existing peak kW
  • Service amps

Related calculators

Screening tool. EV charging is a continuous load per NEC 625.41 (size at 125%). Verify wire, breaker, and service sizing against the NEC as adopted locally and the AHJ before acting.

Saved calculations

Keep the assumptions with the result.

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