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EVSA FIELD GUIDE 02 · CHARGING EXPLAINED

Charging an EV should fit around your life.

I’ll help you work out whether a normal wall socket is enough, when a wallbox is worth it and what to plan before relying on public charging.

Electric vehicles charging under solar carports and around a globeCLARITY BEFORE COMMITMENT ↗

Most EV charging can happen while you do something else.

If you can park near a suitable power supply at home or work, charging does not need to resemble visiting a petrol station. Plug in when convenient and let the car recover the distance you used that day.

Normal 230 V, 10 A socket≈12 km/h2.3 kW input, 90% efficiency, 18 kWh/100 km
7.4 kW home wallbox≈37 km/hRequires suitable supply, installation and vehicle support

Charging speed is affected by the car's onboard AC charger, battery conditions, supply limits and losses. A household socket should only be used with an approved EV charging lead and a suitable circuit checked by a qualified electrician—avoid extension leads and overloaded sockets.

How far could you recharge in a few hours?

Use this simple estimator to compare household-socket and wallbox charging. Values are approximate distance added, not guaranteed driving range.

Estimated usable range recovered148 km26.6 kWh into the battery, assuming the vehicle accepts the selected power

What about solar and batteries at home?

If you already have rooftop solar, it may be possible to schedule EV charging for daylight hours and use surplus solar generation. The useful questions are whether you have available PV production, inverter headroom, enough charging time and a suitable way to control charging power.

When the sun is unavailable, battery storage can support EV charging, but using expensive home-battery capacity for vehicle charging is not always the most economical choice. I would prioritise household backup needs and calculate the full energy balance.

Worth checking

A 7.4 kW wallbox is not automatically the best choice for an off-grid home. Its draw may exceed spare inverter output even when the EV could otherwise charge happily at a lower rate.

Using public chargers in South Africa

Public AC chargers are useful for longer stops, while DC fast chargers can make intercity journeys more practical. Vehicle compatibility, station condition, payment method, connector type and public charging price matter.

Before setting off, I recommend checking a live charging map, confirming that the site is operational and planning an alternative where feasible.

The availability and backup arrangements of public stations change. Confirm details directly with the network before depending on a specific stop.

What I'd check before installing a wallbox

  • Available supply capacity and single- or three-phase power.
  • Distribution-board condition, protections, earthing and installer requirements.
  • Parking position, cable reach and weather exposure.
  • Your EV's maximum AC charging rate and connector compatibility.
  • Solar diversion, load management and inverter power limits if applicable.
  • Actual daily kilometres: you may not need a large charger at all.

Further reading & useful resources

These are independent resources for background and verification. Charging availability, prices and product specifications can change.

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