วิธีการคำนวณ EV Home Charging Cost
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An EV home charging cost calculator estimates the electricity cost and time to charge an electric vehicle at home from a given battery level to a target level, using a standard 7.4kW home charger.
สูตร
cost_per_charge = battery_kwh × electricity_rate ($/kWh); cost_per_mile = cost_per_charge / range_miles
- kwh
- Battery size (kWh) — Vehicle battery capacity (e.g., 60 kWh)
- rate
- Electricity rate ($/kWh) — Grid electricity price (typically 0.12–0.18 $/kWh)
- range
- Range (miles) — Miles per full charge
- cost
- Cost per charge ($) — Total to fully charge battery
คำแนะนำทีละขั้นตอน
- 1Energy needed = Battery capacity × (target% − current%) ÷ 100
- 2Cost = Energy (kWh) × electricity tariff ($/kWh)
- 3Charge time = Energy needed ÷ charger power (kW)
- 4Standard home charger: 7.4kW (32A single phase)
ตัวอย่างที่มีคำตอบ
อินพุต
Tesla Model 3 (75kWh), 20%→80%, $0.30/kWh
ผลลัพธ์
45kWh added, cost $13.50, ~6h 5min charging
อินพุต
Nissan Leaf (40kWh), 10%→100%
ผลลัพธ์
36kWh, cost $10.80, ~4h 52min
อินพุต
Full charge daily, 30kWh needed
ผลลัพธ์
$9/day = $270/month at $0.30/kWh
คำถามที่พบบ่อย
How much does it cost to charge an EV?
60 kWh battery × $0.14/kWh = $8.40 full charge. At 250 mi range = $0.034/mile fuel cost (vs. gas: $0.10–0.15/mile).
What about charging at home vs. public chargers?
Home (Level 2): cheapest (~$0.12/kWh). Public DC fast chargers: 2–3× more ($0.30+/kWh) but faster.
Is there a federal EV tax credit?
US: up to $7,500 for new EVs (income/price caps apply). Some states add rebates. Check eligibility.
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