EV充電時間計算機

電気自動車の充電にかかる時間は？

バッテリー容量・初期SOC・目標SOC・充電出力を入力すると、充電時間・壁から供給される電力量・セッションあたりのコストを計算式とともに推算します。

EV charging calculator

Charge session estimate

Charging mode

Distance unit

Battery capacity

kWh

Current charge

Target charge

Charger power

Charging efficiency

Electricity price

$/kWh

EV efficiency

mi/kWh

Estimated charge time4 hr 33 min

Wall energy50 kWh

Session cost$8.00

Range gained158 mi

Cost per mile$0.05

SOC change

Battery energy

Wall energy

How the math works

Energy needed at the battery = Battery capacity × (target SOC − current SOC) ÷ 100.
Wall energy = Battery energy ÷ Charging efficiency. Most home AC chargers run 88–92% efficient; cold-weather and DC fast charging can drop below 85%.
Charging time = Wall energy ÷ Charger power (kW). DC fast charging slows substantially above ~80% SOC, so most road-trip planners stop at 80%.

Worked examples

Tesla Model Y on a Level 2 home charger

75 kWh battery, 20 → 80% on an 11.5 kW Wall Connector at 90% efficiency → ≈ 4.3 hours and 50 kWh from the wall. At $0.16/kWh that is roughly $8.00 per session.

Ford F-150 Lightning Extended Range on DC fast

131 kWh battery, 10 → 80% at 150 kW peak (≈ 105 kW average due to taper) at 88% efficiency → ≈ 60 minutes and ~104 kWh delivered.

Hyundai IONIQ 5 on Level 1 (overnight)

77 kWh battery, 30 → 80% on a 1.4 kW outlet at 85% efficiency → ≈ 32 hours total — Level 1 is only practical for very low daily miles.

EV charging time FAQ

Why is my actual charging slower than the calculator?

Real-world DC fast charging tapers from a peak rate down to ~25% at the end of the curve. The calculator uses a steady average; for trip planning subtract ~10% from the peak charger spec.

Does temperature affect charging time?

Yes. Below 0 °C the battery management system pre-conditions and de-rates power, often adding 10–25% to fast-charge time. Home AC charging is barely affected.

Should I charge to 100% every day?

For LFP packs (Tesla Model 3/Y RWD, Ford Standard Range) charging to 100% is recommended weekly. For NMC packs Tesla, Hyundai, and Ford all suggest 80–90% daily.

What efficiency should I use?

Use 90% for typical 7–11 kW home AC charging, 88% for cold-weather garage, and 92% for warm-weather Level 2. DC fast charging averages 88–93% at the battery terminals.

Can I split a Level 2 home charger with another EV?

Most networked chargers (Wallbox, Tesla Wall Connector, ChargePoint) support load balancing. Two cars on a 48 A circuit share ~5.7 kW each, so the calculator time roughly doubles.

計算機ディレクトリ