45 kWh EV Battery Charging Time on 3.7 kW (230V 16A Type 2 Wallbox)
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 Time9h 28m20%–80%: 8h 06m
Full 0% to 100% Time13h 49mGrid Energy: 50.0 kWh
Driving Range Added / Hour+19.0 km/h+11.8 miles / hour
Circuit Breaker Required20A (NEC)15.4A @ 240V (1P)
Charging Time & Electrical Specification Table (45 kWh @ 3.7 kW)
| EV Battery Usable Capacity | 45 kWh |
| Charger Output Rating | 3.7 kW (230V 16A Type 2 Wallbox) |
| 10% to 80% Charging Time (Daily / Highway Optimal) | 9h 28m (9.46 hours) |
| 20% to 80% Charging Time | 8h 06m (8.11 hours) |
| 0% to 100% Full Charge Time (with BMS Tapering) | 13h 49m (13.82 hours) |
| Estimated Full Charge Cost (US / Germany / Sweden) | $8.75 (US) · €17.0 (DE) · 82.5 kr (SE) |
| Continuous Current Draw & Breaker | 15.4 A @ 240V (1-Phase) → 20A NEC / 16A IEC Breaker |
Frequently Asked Questions
How long does it take to charge a 45 kWh EV battery at 3.7 kW?
Charging a 45 kWh electric vehicle battery from 10% to 80% on a 3.7 kW (230V 16A Type 2 Wallbox) takes approximately 9h 28m (or 13h 49m for a full 0% to 100% charge including charger efficiency and BMS tapering).
What breaker size is required for a 3.7 kW EV charger?
At 240V (1-Phase), a 3.7 kW charger draws 15.4A continuously, requiring a 20A breaker under US NEC 625.41 (125% continuous load rule) or a 16A breaker under European IEC/NEK standards.
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