Charging Level Comparison and Infrastructure Requirements
EV charging is categorized into three levels based on power delivery. Level 1 charging uses a standard 120V AC outlet (NEMA 5-15) at 12–16 amps, delivering 1.4–1.9 kW. This charges approximately 4–6 miles of range per hour — adequate for overnight home charging of a PHEV or low-mileage EV driver. Level 2 charging uses 240V AC at 16–80 amps, delivering 3.8–19.2 kW, adding 10–60 miles of range per hour. A standard residential Level 2 EVSE (Electric Vehicle Supply Equipment) operates at 7.2–11.5 kW. Commercial Level 2 stations at 19.2 kW (80A at 240V) are common in workplaces and public parking. Level 3, also called DC Fast Charging (DCFC), bypasses the vehicle's onboard AC-DC charger and delivers DC power directly to the battery through a CCS (Combined Charging System, North American standard), CHAdeMO (legacy Japanese standard), or NACS (Tesla's standard now adopted by most manufacturers) connector. DCFC power levels: 50 kW (older stations, adds ~170 miles/hour), 150 kW (common modern DCFC, adds ~500+ miles/hour), 350 kW (ultra-fast, primarily for high-voltage vehicles like Porsche Taycan 800V). Commercial fleet charging installation design must account for: peak demand load (all vehicles charging simultaneously), electrical service capacity, cable sizing (NEC Article 625 governs EV charging circuits — ampacity must be 125% of continuous load, e.g., an 80A Level 2 circuit requires 100A-rated conductors and breaker), and conduit routing.