Background
As electric vehicle adoption grows worldwide charging infrastructure operators face a challenge. It’s not about adding more charging points. The real challenge is. Maintaining thousands of charging points in a reliable and cost-effective way.
Here are some issues that EV charging point manufacturers and operators face:
- Different types of hardware
- Charging points are spread out geographically
- Operation and maintenance costs are increasing
Many charging facilities are in areas roadside parking lots, logistics hubs or temporary sites. In these areas fixed-line broadband is not available. Is too expensive.
Users expect more from charging services. They want features like:
- Charging navigation
- Real-time status updates
- Reservation
- Fault notifications
- Automated billing
All these services rely on an internet connection between the charging point and the central management platform. Without connectivity even the best charging hardware can’t provide a good user experience, with electric vehicles.
Networking Requirements in Real Deployments
From an engineering perspective, EV charging networking has several non-negotiable requirements.
First, installation must remain simple. Many charging sites lack wired communication conditions, making cellular connectivity the most practical option. In these cases, 4G cellular DTU solutions provide the flexibility needed for rapid deployment and future expansion.
So charging piles are usually outside in the weather. They have to deal with heat and moisture and other things like noise and vibration. This means that all the equipment that connects to the internet has to be really strong and meet standards not just be like the stuff you have at home.
Next it is very important that everything keeps working. Some places need to have than one way for the internet to work so if one way stops working the other way can still work. The equipment has to be able to use both wires and wireless connections to make sure the data keeps flowing even when the internet is not working perfectly.
Lastly the size of the system is important. When you have hundreds or thousands of charging piles in a city or area you need to be able to watch all of them from one place and manage them in groups to keep costs from getting too high. Charging piles need to be managed in a way that makes sense for the people, in charge of them.
Decentralized Charging Piles and Cellular DTU Architecture
For decentralized charging piles located in residential communities or parking areas, a serial-based communication architecture remains common. In these scenarios, the charging pile control board communicates via RS232 or RS485 interfaces.
This is where the Valtoris Industrial 4G DTU plays a central role. Acting as a Serial to 4G LTE Modem, it converts RS232/RS485 data into secure cellular transmissions, enabling transparent communication between field devices and the operation center.
The system uses Modbus 4G DTU to keep an eye on things like voltage, current, power consumption and charging status in real time. If something goes wrong the system tells the maintenance teams away so they can fix the problem before it gets bigger.
One good thing about this way of doing things is that it saves money. Using a 4G Data Transfer Unit is better than using a router because it takes up less space uses less power and is easier to set up. This makes Modbus 4G DTU a great choice, for projects that are spread out over a large area.
Centralized and Group Charging Stations
In larger public charging stations—such as those serving public transport fleets, logistics centers, or highway service areas—charging piles are often connected via Ethernet to form a local area network. In these systems, a centralized gateway handles upstream communication.
Even in these environments, industrial cellular modem router solutions built on DTU technology are widely adopted, especially when wired networks are unreliable or unavailable. With support for Industrial 4G LTE Router functions and VPN encryption, centralized stations can securely connect to private networks or cloud platforms.
Features such as automatic Ethernet-to-cellular failover ensure continuous data transmission. While cellular latency may occasionally be slightly higher than fiber, the trade-off is acceptable for most charging management systems where reliability outweighs raw speed.
Security and Data Integrity
Security is no longer optional in EV charging infrastructure. The ValtorisIndustrial Cellular Modem integrates VPN technologies including IPSec and OpenVPN, ensuring that charging data, billing records, and operational commands remain protected during transmission.
Using MQTT makes it really easy to connect to the cloud. This means that the system can talk to charging platforms and energy management systems in a very efficient way.
One thing to note is that setting up a VPN for the time can be a bit tricky. You need to know a thing or two about networking to get it right.. Once you have it up and running the system is very stable and you do not have to do much to keep it working properly.
Why Operators Are Moving Toward DTU-Based Solutions
When you look at the picture the people in charge are starting to think that it is more important to have systems that can grow and be cost effective in the long run. They like the DIN-rail 4G DTU because it lets them add charging stations as they need to without having to start from scratch every time.
The good thing about these systems is that they can be controlled from one place and you can update the software from away. This means that the people in charge can manage a lot of charging stations without needing to hire a lot staff. That is why the industrial 4G DTU for electric vehicle charging stations is becoming really popular in places like Europe, Southeast Asia and other areas where electric vehicles are getting more common. The industrial 4G DTU is a choice, for electric vehicle charging stations because it is easy to use and manage.
