EV Charging Speed: What the Numbers Actually Mean
Every EV charger is advertised with a "miles per hour" figure. Those numbers are real, but they hide enormous differences between 12 minutes at a Tesla Supercharger and 3 days on a garage outlet. This guide lays out what each level delivers in the real world, using measurements from our service trucks and customer cars in Henderson over the last 12 months.
The Three Levels at a Glance
| Level | Voltage | Typical kW | Miles per Hour | 0 to 80% (70 kWh battery) |
|---|---|---|---|---|
| Level 1 | 120V | 1.4 to 1.9 kW | 3 to 5 | 28 to 40 hours |
| Level 2 | 240V | 3.8 to 19.2 kW | 12 to 55 | 4 to 9 hours |
| DC Fast (Level 3) | 400-800V DC | 50 to 350 kW | 150 to 1,000+ | 15 to 45 minutes |
Level 1: The Wall Outlet Charger
Every EV ships with a portable Level 1 cord that plugs into a standard 120V household outlet. It draws 12 amps at 120V = 1.44 kW.
Real-world speed: 3 to 5 miles of range per hour. At 4 mph, a 40-mile commute takes 10 hours to replace. That works overnight if you drive less than 50 miles per day.
Who Level 1 actually suits:
- Plug-in hybrid owners (Prius Prime, RAV4 Prime, Volvo Recharge)
- Retirees and work-from-home drivers
- Apartment dwellers with a shared outlet
Who it does not suit: Anyone commuting more than 40 miles round-trip, running errands on top, or driving a long-range BEV with an 80+ kWh battery. You will fall behind.
Need a professional installation quote?
Henderson EV Charger Pros handles everything — permits, wiring, and installation. Free estimates, no obligation.
Level 2: The Home Standard
This is what we install at 95 percent of Henderson homes. 240V at 16A to 80A, delivering 3.8 kW to 19.2 kW. See our full Level 1 vs Level 2 breakdown for cost numbers.
Real-world speed at common amperages:
- 16A (3.8 kW): 12 mph. Basic plug-in portable on a 20A breaker.
- 32A (7.7 kW): 28 to 30 mph. NEMA 14-50 outlet with Tesla Mobile Connector. Full overnight.
- 40A (9.6 kW): 34 to 36 mph. Common hardwired setup on 50A breaker.
- 48A (11.5 kW): 40 to 44 mph. Tesla Wall Connector or ChargePoint Home Flex on 60A breaker.
- 80A (19.2 kW): 55 to 60 mph. Tesla Wall Connector Gen 2 or dual-charger setups. Rare in homes; needs 100A circuit.
Most modern EVs cap Level 2 acceptance between 7.7 kW and 11.5 kW on the car side, even when the charger can deliver more. A Hyundai Ioniq 5 caps at 11 kW. A Chevy Bolt caps at 7.2 kW. Check your car before buying the biggest charger.
DC Fast Charging (Level 3)
DC fast bypasses the car's onboard charger and dumps high-voltage DC straight into the battery. This only happens at commercial stations. No residential DC fast chargers exist that make sense for homes (the cheapest unit is about $15,000 plus transformer work).
Speed tiers in 2026:
- 50 kW (ChargePoint CPE250, older stations): Adds 150 miles in an hour.
- 150 kW (most Electrify America, EVgo): Adds 10 to 20 miles per minute at peak, typically 30 minutes for 10 to 80 percent.
- 250 kW (Tesla V3 Supercharger, Ionna, new EA stations): Peaks at 30 miles per minute. 15 to 25 minutes for 10 to 80 percent.
- 350 kW (EA hyperfast, some Tesla V4): Only a few cars can pull this (Lucid Air, Kia EV6 GT, Ioniq 5, Porsche Taycan). 18 minutes 10 to 80 percent.
The charging curve myth. A "350 kW" station does not charge your car at 350 kW the whole time. The car ramps up as it pre-conditions the battery, peaks between 20 and 50 percent state of charge, then drops steeply. Above 80 percent most cars cut to 50 kW or less to protect the battery. That is why every road-trip planner tells you to leave at 80 percent, not 100.
Home Level 2 vs Public DC Fast: Cost Per Mile
Henderson electricity (NV Energy residential, 2026): $0.13 per kWh on-peak, $0.08 off-peak.
Typical Electrify America pass member: $0.36 per kWh.
Tesla Supercharger: $0.25 to $0.55 per kWh depending on time and station.
For a car getting 3.5 miles per kWh:
- Home off-peak: 2.3 cents per mile
- Home on-peak: 3.7 cents per mile
- Tesla Supercharger: 7 to 16 cents per mile
- Electrify America: 10 cents per mile
A home Level 2 pays for itself in 9 to 18 months versus charging only at public DC fast stations.
Which Level Should You Install at Home?
- Drive less than 30 miles per day and have a PHEV: Level 1 is fine.
- Drive 30 to 80 miles per day with a BEV: Level 2 at 32A to 40A. NEMA 14-50 or hardwired.
- Drive 80+ miles, own two EVs, or want fastest overnight charge: Level 2 at 48A, hardwired Tesla Wall Connector or similar.
- Need DC fast at home: Not practical. Use public stations for road trips.
Henderson EV Charger Pros installs Level 1 diagnostics, Level 2 at every amperage, and commercial DC fast for fleet clients. Call (838) 205-8397 for a home assessment.
Charging speeds vary by vehicle, battery state of charge, temperature, and station power sharing. Figures above reflect typical conditions.