EV charging time calculator

Use this calculator when the work question is about charging duration rather than circuit design. A facilities user may need to plan how long a car park charger is occupied. A homeowner may want a rough overnight charging window. An estimator may want the supplied kWh before comparing simple tariff assumptions. Those are different questions from cable sizing, maximum demand or DNSP connection review.

The page deliberately uses a small set of entered values. Battery capacity, state-of-charge change, charger power and efficiency are enough to build a transparent time estimate. The result should still be read as a planning record because EV charging behaviour can taper as the battery fills, and vehicle or charger control settings can limit the sustained kW value.

Charging Time Use Cases

The strongest record names the charger or vehicle group. A generic "EV charge" entry is harder to review later than "EV-CHARGE-1, 64 kWh, 20% to 80%, 7.4 kW, 92% efficiency".

Charge Duration Boundary

This boundary matters because charging-time pages are often mistaken for installation tools. A time estimate may show that a 7.4 kW charger is adequate for a user's overnight need, but it does not say whether the switchboard, circuit, protection, location or network context is suitable.

Input Checklist

If any of these values are guessed, keep the guess visible in the export. The calculator is useful because it exposes assumptions, not because it hides uncertainty behind a tidy hour value.

Review Workflow

1. Name the vehicle, charger, bay, car park or charging plan reference.
2. Enter the battery capacity basis used by the planning record.
3. Enter the start and target state-of-charge values.
4. Enter the sustained charger power expected for the session.
5. Enter the charging efficiency assumption.
6. Read battery energy and supply energy before reading the time result.
7. If duration is long, review whether charger power, vehicle limit or target state of charge should change.
8. Use supplied kWh for cost estimation only when a tariff value is entered separately.
9. Use the charger current or EV load calculator if the result feeds installation planning.
10. Keep manufacturer, site, DNSP and Australian electrical requirements outside this time-only estimate.

This workflow keeps a consumer-style time question from drifting into an installation decision. A charging session can be practical for the user and still require separate electrical review.

Worked Records

The examples are deliberately simple. They show how sensitive duration is to charger power and efficiency, but they do not publish a universal result for any vehicle model.

Australian Context

Australia's 230/400 V a.c. supply context matters when charging time becomes a circuit or load-planning question. This page does not calculate current, maximum demand, voltage drop, protection, RCD requirements, switchboard capacity or DNSP connection requirements. Use the related calculators when the time estimate needs to become an electrical installation record.

The public result should be treated as an energy and time worksheet. Current standards, charger manufacturer instructions, vehicle documentation, local authority requirements, DNSP requirements and site-specific electrical constraints can override how the charging plan is used.

Stop Points

• Battery capacity basis is unknown or mixed between usable and nominal values.
• Charger power is a nameplate value but the vehicle or charger will not sustain it.
• Efficiency is copied without a vehicle, charger, metered or planning basis.
• Target state of charge is being used as a guarantee of real charging behaviour.
• Supplied kWh is being used for cost without a separate tariff input.
• The time result is being treated as circuit current, maximum demand or DNSP evidence.