A smart charger’s connectivity module — one component among its relays, metering and control boards — decides how the unit reaches its platform. Wi-Fi rides the site’s own network at no per-unit data cost. A 4G cellular module brings its own connection, with a SIM and a data plan. Ethernet is a fixed wired link. Bluetooth is a short-range local channel, used mainly for setup and service. None is best in general; the site decides.
Key Takeaways
- Wi-Fi, 4G and Ethernet are backhauls with different site needs and cost shapes; Bluetooth is a local setup channel.
- Verify signal at the charger’s exact position — coverage, not the spec sheet, decides reliability.
- At fleet scale, per-unit data plans and one-time cabling trade against each other; do the arithmetic per site.
- A listed feature such as an app or OCPP does not name the module behind it — ask in writing.
The Four Modules at a Glance
| Module | How it connects | What the site must provide | Ongoing cost | Where it fits best |
|---|---|---|---|---|
| Wi-Fi | The site’s wireless LAN | Router coverage at the charger’s exact position | None per unit | Homes, depots and workplaces with managed Wi-Fi |
| 4G / cellular | The mobile network, via a SIM in the unit | Mobile signal at the position, and a data plan | A per-unit data subscription | Public and commercial sites with no trusted site network |
| Ethernet | A cable to the site’s network switch | A cable run to each unit | None per unit | Multi-unit sites where cabling is planned anyway |
| Bluetooth | A direct short-range link to a phone or tablet | Nothing — but someone must be standing there | None | Commissioning, app setup and local diagnostics |
Choosing by Site, Not by Spec Sheet
Coverage is the first check, and it is physical: basement car parks and metal-clad buildings weaken both Wi-Fi and mobile signals, so verify signal at the charger’s mounting position — not in the site office. Antenna placement inside the enclosure is part of the module’s design; a design that works on an open wall may struggle inside a metal cabinet. The second check is arithmetic at fleet scale: a per-unit data plan is a small cost for one charger and a standing line item for two hundred, while a single cabling job at installation can remove that cost permanently. The third is control: Wi-Fi and Ethernet put the charger on the site owner’s network and its security rules; cellular keeps each unit independent.
Bluetooth Is a Setup Channel, Not a Backhaul
Bluetooth’s role is local. It pairs a phone to the charger during commissioning, carries app setup, and gives a technician a link at the unit. It does not reach a remote platform: monitoring, billing and remote control need a backhaul — Wi-Fi, 4G or Ethernet. A charger specified with Bluetooth alone is a locally managed charger, whatever the brochure’s “smart” label says. Many designs fit Bluetooth alongside a backhaul module so setup never depends on the site’s network being ready.
The Module Is Not the Platform
Connectivity hardware and charging software are separate layers. A protocol such as OCPP runs over whichever backhaul the hardware provides, and features like RFID access or an app say nothing by themselves about which radio or cable carries the data — our explainer on OCPP and charger hardware covers the operator side of that split. For a buyer the rule is simple: a datasheet line naming a feature does not specify the module behind it. Ask which module — and which plan or cable it assumes — in writing.
Connectivity in the EVDANCE Range
Our listings name connectivity features, not the modules behind them — stated exactly as listed: the EV-ACT3204E wallbox lists RFID and app; the EV-AC03201T dual-connector station lists OCPP 1.6J and RFID; the EV-RHDC30K-L compact DC charger lists OCPP 1.6J. Which module carries those features in a given configuration is a specification question — raise it before planning a site’s network, through contact us or the commercial solutions page. EVDANCE is a Shenzhen manufacturer founded in 2011, exporting to more than 30 countries, with private label from 100 units.
Frequently Asked Questions
Can one charger carry more than one connectivity module?
Yes — designs commonly pair a backhaul (Wi-Fi, 4G or Ethernet) with Bluetooth for setup and service. Confirm which modules your exact configuration includes, in writing, rather than assuming the full set.
Which module suits a site with no Wi-Fi?
4G, where mobile signal is verified at the mounting position, or Ethernet where a cable can be run. Test where the charger will stand — a strong reading at the gate says little about a basement bay.
Does the connectivity module affect charging speed?
No — the module carries data, not power. Charging power is set by the charger’s rating, the vehicle and the circuit; the module only decides how the unit reports and is managed.
Related Reading
- OCPP Explained: What Charge Point Operators Need From EV Charger Hardware
- Do Home EV Chargers Need Wi-Fi?
- Does the Tesla Wall Connector Need Wi-Fi?
- How to Test an EV Charger
