How fast is 7.4 kW vs 11 kW vs 22 kW at home?

Rough guide: 7.4 kW adds about 30–40 km of range per hour for many EVs; 11 kW is ~50% faster; 22 kW needs three-phase and a car onboard charger that accepts it. The car’s onboard AC limit usually caps you before the wallbox does.

EV charging

Do I need three-phase power for a home EV charger in South Africa?

Q: Do I need three-phase power for a home EV charger in South Africa?

No — not for most commuters. A single-phase ~7.4 kW Type 2 wallbox overnight restores a typical commuting battery. You need three-phase (and often municipal approval for a supply upgrade) when you want 11–22 kW home AC charging, run large workshop loads at the same time, or already have a three-phase service. Confirm supply type and NMD before buying a charger.

Updated 26 October 2026

Answer first: No — not for most South African commuters. A single-phase ~7.4 kW Type 2 wallbox overnight restores a typical commuting battery. You need three-phase (and often municipal approval for a supply / NMD upgrade) when you want 11–22 kW home AC charging, already have a three-phase service, or will run large workshop loads alongside the car. Confirm supply type on the meter / DB before you buy hardware.

Single-phase ~7.4 kW

Default SA home charger class — overnight fill for most EVs.

Three-phase 11–22 kW

Faster home AC; needs three-phase DB, charger and car onboard support.

DC public fast

Road trips — not a substitute for cheap home AC kilometres.

Why ~7.4 kW is enough for most homes

Most SA suburban supplies are single-phase. At ~32 A single-phase you land near 7.4 kW. Park for 8–10 hours and you can put ~60–70 kWh into the car — more than many weekly commute packs. The car’s onboard AC charger is the real speed limit: a wallbox rated 22 kW cannot force a 7 kW car to accept 22 kW on AC. See power levels.

When three-phase is worth chasing

You regularly need a near-full pack in a few daytime hours (two-car household, long daily km, tradespeople).
You already have three-phase for a workshop, borehole or large heat pump.
You want an 11 kW or 22 kW wallbox that your car can actually use.
You are pairing with a three-phase hybrid inverter and want balanced phases — solar single vs three-phase.

Supply upgrade reality (not just the electrician’s quote)

Moving from single- to three-phase is a distributor / municipal matter: application, possible service cable / meter change, Notified Maximum Demand (NMD) and ongoing network charges. Budget time and fixed monthly costs, not only the wallbox. A load-managed 7.4 kW charger on the existing single-phase supply is often cheaper than a supply upgrade you barely use.

Load management still matters on either supply

Geyser + oven + wallbox will trip a busy DB whether you have one phase or three. Dynamic load management (or a scheduled charge window) protects the main breaker and keeps the EV off a small backup battery during shedding — load management. Wiring and CoC: EV charger wiring & CoC.

Worked overnight maths (illustrative)

Suppose your EV uses ~18 kWh/100 km and you drive 60 km/day → ~11 kWh/day. At 7.4 kW you need roughly 1.5 hours of wallbox time. Even a 40 kWh nightly top-up is under six hours — well inside a workday-away or sleep window. Jumping to 11 kW only matters when the car is home for short daytime windows or you share one bay between two long-range EVs.

Solar hybrid interaction

A single-phase ~7.4 kW wallbox on a single-phase hybrid is the common SA pairing. Three-phase hybrids can balance a three-phase wallbox, but only if NMD, inverter continuous rating and export rules allow the simultaneous draw. Keep the charger off a small backup pack during shedding — the car can wait; the fridge cannot. Sizing: solar + EV · whole-home order: heat pump + solar + EV.

Cost notes (illustrative)

Hardware for a quality Level-2 / AC wallbox often sits roughly R8 000–R25 000+; install varies with cable run and DB work — home charger cost. Three-phase units and municipal upgrades sit on top of that. Brand shortlist with SA stock evidence: EV home charger brands SA. Named public DC price evidence for SAEV’s Richmond site (~R3.49/kWh vs GridCars ~R7.35) is on DriveElectric — useful for road trips, not a reason to skip home AC.