⚡ Cu ρ (75°C): 0.0214 Ω·mm²/m 🔌 NEC / IEC Standards: NFPA 70 & IEC 60364 🇺🇸 US Grid Avg: $0.175/kWh 🇩🇪 DE Grid Avg: €0.345/kWh 🇸🇪 SE Elpris: 1.54 SEK/kWh 🇳🇴 NO Strøm: 1.17 NOK/kWh 🔩 Copper Ref: $9,650/t (2026-10-25)
🚗 EV Charging Time · NEC Article 625 · IEC 61851 Wallbox Sizing

28 kWh EV Battery Charging Time on 1.4 kW (120V 12A Level 1 Portable)

Real-world charging duration (10–80%, 20–80%, and 0–100%), range added per hour, charging cost, and electrical circuit breaker sizing.

10% to 80% Charge Time15h 33m20%–80%: 13h 20m
Full 0% to 100% Time22h 44mGrid Energy: 31.1 kWh
Driving Range Added / Hour+7.2 km/h+4.5 miles / hour
Circuit Breaker Required15A (NEC)11.7A @ 120V (1P)

Charging Time & Electrical Specification Table (28 kWh @ 1.4 kW)

EV Battery Usable Capacity28 kWh
Charger Output Rating1.4 kW (120V 12A Level 1 Portable)
10% to 80% Charging Time (Daily / Highway Optimal)15h 33m (15.56 hours)
20% to 80% Charging Time13h 20m (13.33 hours)
0% to 100% Full Charge Time (with BMS Tapering)22h 44m (22.73 hours)
Estimated Full Charge Cost (US / Germany / Sweden)$5.44 (US) · €10.57 (DE) · 51.31 kr (SE)
Continuous Current Draw & Breaker11.7 A @ 120V (1-Phase) → 15A NEC / 13A IEC Breaker

Frequently Asked Questions

How long does it take to charge a 28 kWh EV battery at 1.4 kW?

Charging a 28 kWh electric vehicle battery from 10% to 80% on a 1.4 kW (120V 12A Level 1 Portable) takes approximately 15h 33m (or 22h 44m for a full 0% to 100% charge including charger efficiency and BMS tapering).

What breaker size is required for a 1.4 kW EV charger?

At 120V (1-Phase), a 1.4 kW charger draws 11.7A continuously, requiring a 15A breaker under US NEC 625.41 (125% continuous load rule) or a 13A breaker under European IEC/NEK standards.

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