EV Charging Connectivity: Secure Global Networks Under NIS2

EV charging networks require more than basic IoT connectivity. To meet uptime and NIS2 security requirements, you need multi-network global connectivity, private routing, and Zero Trust enforcement. Most failures come from roaming instability and VPN-based security. A multi-IMSI Global SIM with CMP control is the standard for scalable EV deployments.

04.05.2026

Smart City

Why EV charging connectivity is now a critical risk layer

EV charging is no longer just infrastructure.

Each charger is:

a payment endpoint
a grid-connected asset
a remotely managed device
part of a distributed network

That makes connectivity a single point of failure.

When connectivity fails:

charging sessions stop
payments fail
backend systems lose visibility
SLAs are breached

At scale, this becomes:

lost revenue
customer churn
regulatory exposure

What NIS2 changes for EV charging operators

NIS2 introduces stricter requirements for:

critical infrastructure
digital services
energy systems

For EV operators, this means:

You must demonstrate:

network segmentation
secure communication paths
incident detection and response
resilience across distributed systems

Basic connectivity models (roaming + VPN) do not meet these requirements.

How EV charging connectivity actually works

To understand the risk, you need to understand the flow.

Typical EV data flow

Charger connects to mobile network
Traffic routed to backend (CPO platform)
Backend communicates with:

payment systems
energy management systems
roaming platforms (eMSPs)

Commands sent back to charger

Where failures happen

1. Network layer

weak signal
roaming instability
single operator dependency

2. Routing layer

traffic over public internet
unpredictable latency
exposure to attacks

3. Access layer

VPN grants broad access
no segmentation

4. Visibility layer

no real-time insight
delayed issue detection

The real threats in EV charging connectivity

1. DDoS and endpoint exposure

If chargers are exposed:

attackers can target endpoints
VPN gateways become entry points

Result:

service disruption
degraded performance

2. Roaming instability (most common issue)

EV deployments rely heavily on roaming.

Problems:

network prioritisation issues
inconsistent latency
connection drops

What this causes:

chargers appear offline
failed transactions
poor user experience

3. Lateral movement risk

Without segmentation:

one compromised charger
can access internal systems

Common in:

APN-only networks
VPN-based architectures

4. Payment and data exposure

EV chargers process:

payment data
session data
location data

Without secure routing:

data travels over public networks
visibility is limited

5. Lack of real-time visibility

Most operators cannot answer:

which chargers are failing now
why they are failing
what traffic they are generating

Result:

slow troubleshooting
increased downtime

Why traditional connectivity models fail

Public internet + SIM

no routing control
exposed endpoints

Result: high attack surface

APN-based models

private but shared trust zone

Result:

no segmentation
no behaviour control

VPN-based models

encryption only

Critical problem:

once connected → full network access

Result:

lateral movement risk
management complexity
performance bottlenecks

Single-operator dependency

one network per region

Result:

no fallback
downtime when network fails

Fragmented connectivity providers

multiple MNOs
no central control

Result:

inconsistent performance
operational overhead

Connectivity patterns: what fails vs what scales

Pattern that fails

single IMSI SIM
roaming-based connectivity
VPN security
no centralised control

Outcome:

inconsistent uptime
high operational cost
security gaps

Pattern that scales

multi-IMSI Global SIM
multi-network per country
private networking
Zero Trust enforcement
CMP-driven control

Outcome:

higher uptime
controlled security
predictable performance

What causes EV charger downtime (real scenarios)

Scenario 1: Network outage

device locked to one network
no fallback

Result: charger offline

Scenario 2: Roaming degradation

device connected via roaming
low priority on visited network

Result: unstable performance

Scenario 3: No visibility

issue occurs
no alerting

Result: delayed resolution

Scenario 4: Security incident

compromised charger
unrestricted access

Result: wider network exposure

The architecture that works for EV charging

1. Multi-IMSI global connectivity

multiple operator profiles
automatic network switching
resilience across regions

Impact: reduces downtime and roaming dependency

2. Private networking (SecureNet model)

traffic stays off public internet
private IP addressing
direct routing to backend systems

Impact:

reduced attack surface
predictable data flow

3. Zero Trust enforcement (network layer)

every connection validated
access controlled per application
segmentation enforced

Impact:

prevents lateral movement
limits breach impact

4. CMP (control and visibility)

real-time monitoring
alerts and diagnostics
SIM lifecycle control

Impact:

faster issue resolution
full operational visibility

5. Data pooling

shared data across chargers
no per-device waste

Impact:

predictable cost
better utilisation

NIS2-ready EV connectivity checklist

Use this to assess your current setup:

Connectivity

multi-network per country
automatic switching

Routing

no public internet exposure
private network paths

Security

Zero Trust enforcement
segmented systems

Visibility

real-time monitoring
anomaly detection

Management

CMP control layer
lifecycle automation

If any of these are missing, your network is exposed.

Why SIM choice alone does not solve EV connectivity

Many operators focus on:

SIM vs eSIM

This does not solve:

roaming instability
security exposure
lack of visibility

You can deploy eSIM and still experience:

downtime
security incidents
operational inefficiencies

The problem is architecture, not form factor.

Why enterprises choose IXT for EV charging connectivity

IXT is built as a Zero Trust SIM for IoT. Here is what that means in practice for EV charging networks.

Multi-network global coverage

600+ networks
190+ countries
automatic carrier switching

Multi-IMSI architecture

avoids roaming limitations
ensures consistent connectivity

SecureNet private networking

traffic stays off public internet
controlled routing to backend

Zero Trust, powered by Zscaler ZTNA and Illumio

No VPN clients required on devices, no exposed ports
Every connection validated before access is granted
Visual traffic mapping across all device connections
Automatic anomaly detection flags unexpected behaviour
Access controlled per application, not per network

CMP as operational control layer

real-time visibility
diagnostics and alerts
automation and API integration

This is what keeps networks running.

Data pooling

shared usage across chargers
reduced cost variability

What this means for you

higher uptime
faster incident response
reduced security risk
compliance readiness

FAQs

What is the best connectivity for EV charging networks?

The most reliable setup uses multi-network global connectivity with private routing and Zero Trust enforcement. This ensures uptime, reduces exposure, and supports regulatory requirements.

Why is roaming a problem for EV chargers?

Roaming introduces inconsistent performance and limited control. Chargers may be deprioritised on visited networks, leading to instability and downtime.

How does NIS2 impact EV charging infrastructure?

NIS2 requires operators to implement segmentation, monitoring, and incident response. Connectivity must support secure communication and resilience across distributed systems.

What is multi-IMSI in EV connectivity?

Multi-IMSI allows a SIM to switch between multiple operator identities, enabling access to different networks and improving reliability.

Is a private APN enough for EV charging security?

No. APNs provide isolation but not segmentation or Zero Trust enforcement. Additional layers are required to meet modern security standards.

Why are VPNs not suitable for EV charging networks?

VPNs create bottlenecks and grant broad network access. They are difficult to manage at scale and expose gateways to the internet.

What causes EV charger downtime?

Common causes include network outages, roaming instability, lack of fallback connectivity, and lack of real-time monitoring.

How do you improve EV charging uptime?

Use multi-network connectivity, automatic switching, private routing, and real-time monitoring to maintain consistent performance.

How do EV chargers communicate with backend systems?

Chargers send data to backend platforms (CPO systems) for session management, payments, and control. This communication must be secure and reliable.

Can EV chargers be hacked?

Yes. If exposed to public networks or poorly segmented, chargers can be targeted and used as entry points into broader systems.

What is the best architecture for EV charging connectivity?

A layered architecture combining global connectivity, private networking, Zero Trust enforcement, and real-time visibility.

Final recommendation

EV charging connectivity is no longer a basic infrastructure problem.

It is a:

security problem
uptime problem
compliance problem

If your network relies on:

roaming
VPNs
public routing

it will fail at scale.

A modern EV charging network requires:

multi-network global connectivity
private routing
Zero Trust enforcement
real-time visibility

IXT is built for this model.

Review your EV connectivity architecture

Speak to an IoT connectivity specialist to assess your current setup:

identify where downtime risk is coming from
uncover gaps in NIS2 readiness
evaluate roaming and network resilience issues
benchmark your architecture against enterprise EV deployments

Get a clear view of what needs to change before it impacts uptime or revenue.