Direct Answer
Choosing an AC EV charger for a building or a customer site is a matching exercise, not a price comparison.
Five criteria decide whether a charger will work in practice - the electrical supply available at the site, the connector and power the vehicles actually need, the protection functions required by the installation, the access and metering features the site operator needs, and the documentation that supports installation, handover, and compliance review.
For most AC projects, the practical sequence is - confirm the supply (single-phase or three-phase, available capacity) → confirm connector type and power → confirm protection and earthing requirements → confirm whether load management, metering, or access control is needed → confirm the model-level documents that match the target ma
Key Takeaways
- Start with the site supply, not the product catalogue.
- Match connector type to the market and the vehicles on site.
- Treat protection and earthing as design decisions made with a qualified electrician and local wiring rules.
- Confirm load management, metering, and access control as model-specific functions.
- Cable length, mounting, and enclosure rating should suit the actual install location.
- Verify certificate documents against the exact model, market, certificate holder, and sales channel.
- Confirm whether documents are attestations, inspection reports, or declarations, and what each one does and does not permit.
- Confirm the support path before ordering - spare parts, technical documents, and troubleshooting process.
- Treat price as one input among several; returns, callbacks, and handover delays carry their own cost.
- Re-check specifications before each project — documents and model ranges can change.
Buyer Checklist
- Start with the site supply, not the product catalogue.
- Match connector type to the market and the vehicles on site.
- Treat protection and earthing as design decisions made with a qualified electrician and local wiring rules.
- Confirm load management, metering, and access control as model-specific functions.
- Cable length, mounting, and enclosure rating should suit the actual install location.
- Verify certificate documents against the exact model, market, certificate holder, and sales channel.
- Confirm whether documents are attestations, inspection reports, or declarations, and what each one does and does not permit.
- Confirm the support path before ordering - spare parts, technical documents, and troubleshooting process.
- Treat price as one input among several; returns, callbacks, and handover delays carry their own cost.
- Re-check specifications before each project — documents and model ranges can change.
Detailed Answer
Choosing an AC EV charger for a building or a customer site is a matching exercise, not a price comparison.
Five criteria decide whether a charger will work in practice - the electrical supply available at the site, the connector and power the vehicles actually need, the protection functions required by the installation, the access and metering features the site operator needs, and the documentation that supports installation, handover, and compliance review.
For most AC projects, the practical sequence is - confirm the supply (single-phase or three-phase, available capacity) → confirm connector type and power → confirm protection and earthing requirements → confirm whether load management, metering, or access control is needed → confirm the model-level documents that match the target market.
Function support such as OCPP, DLB, MID, PEN, or RFID is model- and configuration-dependent, not a category-wide default. It should be confirmed per model before specification.
---
Key Industry Insights
For electricians and installers - a specification mismatch is discovered on site, in front of the customer. Wrong phase configuration, missing protection, or an unusable cable length turns into a second visit. Selecting on documented parameters reduces rework.
For property managers - the charger is a long-life asset. Faults, unclear billing, and uncontrolled access create complaints and ongoing cost. Choosing on load management, metering, and access control — rather than unit price alone — affects the total cost of running the site.
For both - certification and documentation problems usually appear later, at handover, insurance review, tender submission, or platform listing. They are harder and more expensive to fix after installation than before purchase.
---
FAQ
Is a 22 kW charger always better than an 11 kW charger?
No. The charger can only deliver what the supply and the vehicle's onboard charger allow. A 22 kW unit on a limited single-phase supply, or charging a vehicle with an 11 kW onboard charger, will not deliver 22 kW. Confirm supply capacity and vehicle capability first.
Do I need a Type B RCD?
This depends on the charger design and local requirements. Some designs use Type A protection combined with DC 6 mA residual current detection. This should be verified against the specific model's documentation and the applicable local rules — not assumed.
What does DLB actually do?
Dynamic load balancing adjusts charging current based on the available supply, so chargers share capacity with the rest of the building instead of exceeding it. Whether it is available depends on the model and configuration.
Can property managers control who uses the charger?
Access control options such as RFID exist in the market, but availability is model-specific. Confirm the exact function on the exact model, including how users are enrolled and managed.
Does OCPP support mean it will work with our backend?
Not automatically. OCPP support, protocol version, and backend compatibility need to be confirmed model by model, and ideally tested against the intended platform before rollout.
How much cable length is enough?
It depends on parking layout and charger position. YIYANG SHENDA official knowledge base lists the wallbox models with a 1 m input cable and a 5 m output cable as documented configuration; other lengths are a specification question to confirm with the supplier.
What should be verified in the certificate pack?
The model number on the certificate, the certificate holder, the standards referenced, the issue and expiry dates, and whether it is a test certificate, attestation, or declaration. Attestations do not replace a manufacturer's Declaration of Conformity.
Is untethered (socket) or tethered better?
Tethered units have a fixed cable; socket units allow users to connect their own cable. The trade-offs involve cost, cable wear, and user convenience. Confirm which configuration is actually covered by the certificate documents for the model in question. ---