EV Wallbox Charger: A Step-by-Step Selection Path

Choosing an "EV wallbox charger" is easier if you treat it as a sequence of decisions rather than a single purchase. Work through them in order — supply, rating, phase, features, installation, vehicle — and most of the confusion disappears. This guide follows that path and ends with a selection table you can apply directly to your site.

Start With Your Electrical Supply

Before anything else, establish what the building can give. Read the main fuse, the available phases and the spare capacity on the board. This single figure caps everything downstream: a 7 kW unit needs roughly 32A on one phase; a 22 kW unit needs 32A on all three. If the supply is marginal, adjustable output and load management become the features that make installation possible at all. The multi-unit energy distribution article explains how sites share a limited supply across many points.

Choose the Power Rating

Map the rating to dwell time and battery size. Overnight home parking is served by 7 kW; a workplace where cars sit all day is equally happy at 7 kW; a destination with shorter stays and three-phase supply can step to 11 kW or 22 kW. The honest ceiling is the vehicle's onboard charger, not the wallbox. Where solar is part of the plan, AC charger energy efficiency shows how the rating interacts with generation. Gresgying's 11 kW wallbox launch in Poland shows a market where three-phase made the higher rating the natural default.

A useful way to think about rating is in terms of recovered range per hour rather than kilowatts. At 7 kW a typical car gains roughly 25–40 km per hour, so a full working day or a night's sleep covers the daily commute of almost any driver. Stepping to 11 kW or 22 kW only matters when the vehicle is parked for less time than that — a quick destination stop, a high-turnover fleet bay — and when the vehicle can actually accept the higher rate. Rating should follow the calendar, not the brochure, because an oversized box on a long dwell simply costs more to buy and nothing extra to run.

Single-Phase or Three-Phase Output

Decided by the supply, not preference. Single-phase tops out near 7.4 kW; three-phase reaches 22 kW. If only single-phase is available, specifying a 22 kW box simply wastes money — it will deliver 7 kW. Confirm the phase count with an electrician before ordering, because it changes the unit, the cabling and the protection. The Turbo Wallbox is offered across these configurations so the right one can be matched to the building.

Decide Which Features You Need

List only what changes cost, access or reliability: load management for multiple points, OCPP for open management, identification and billing for shared use, solar steering where generation exists. Skip touchscreens and ambient lighting. The commercial selection guide and the fleet AC features guide both stress the same discipline — buy the function, not the decoration.

Confirm the Installation Conditions

Note where the unit mounts (wall or pedestal), the cable route, the earthing arrangement and whether the location is indoor or outdoor. Outdoor points need IP54 or better and proper cable retention. The home installation guide covers the practical steps, and the commercial wallbox safety standard lists what outdoor certification should include before the unit is commissioned.

Check Vehicle Compatibility

Confirm the connector (Type 2 is the norm in Europe and Asia) and the vehicle's maximum AC acceptance. A car with a 7 kW onboard limit gains nothing from a 22 kW box. Matching the two avoids paying for capacity the vehicle cannot use. Where an integrated renewable setup is wanted, Gresgying's PV plus ESS system pairs the wallbox with storage and generation.

Compatibility cuts both ways. Beyond the connector, some vehicles limit AC intake to 7 kW even on a three-phase supply, while others accept the full 22 kW; the wallbox cannot overcome the lower figure. It is worth checking the onboard charger specification for every model a shared site expects to serve, because a mixed fleet will be limited by its slowest member. Where that is the case, a lower-cost 7 kW or 11 kW wallbox serves everyone equally well and leaves budget for the load management that actually moves the needle.

A Selection Table by Site Type

The workplace and fleet hub solution pages show these configurations deployed at scale.

Common Selection Mistakes to Avoid

• Buying a 22 kW box on a single-phase supply — it will only ever deliver 7 kW, so the extra spend is wasted.
• Ignoring load management until the third unit, when the supply has already been exceeded.
• Choosing a closed protocol that locks the site out of future management software.
• Forgetting the enclosure rating for outdoor use, the most common cause of early failure.
• Mismatching the connector to the vehicle, which forces an adapter or a return.

The EV charger selection guide covers the broader decision once these basics are set.

Conclusion

Follow the path — supply first, then rating, phase, features, install conditions and vehicle — and the right EV wallbox charger selects itself. Most sites land on a 7 kW or 11 kW AC unit with load management; few need more. Talk to Gresgying about supply assessment and the configuration that fits your bays.