NB-IoT (Narrowband Internet of Things) is a cellular connectivity technology designed for low-power, low-data IoT devices that need reliable coverage and long battery life. It operates on licensed mobile networks and is optimized for sending small amounts of data—such as status updates, sensor readings, or alarms—rather than high-bandwidth applications.
How NB-IoT works
NB-IoT is a cellular LPWAN (low-power wide-area network) standard:
– Uses narrow bandwidth (optimized for wide coverage and deep indoor penetration)
– Connects devices to the mobile operator’s network using a SIM/eSIM profile
– Supports intermittent messaging and power-saving modes for long device life
– Designed for low throughput and higher latency compared to LTE/5G data links
Why NB-IoT matters in EV charging and infrastructure monitoring
Most EV chargers use Ethernet or LTE because they need real-time session control and firmware updates. NB-IoT is still useful in the wider charging ecosystem:
– Monitoring transformers, switchboards, and site power quality sensors
– Telemetry for street charging cabinets, parking sensors, or occupancy systems
– Backup “heartbeat” connectivity for basic alarms when primary connectivity fails
– Meter reading or environmental sensors (temperature, flooding detection in cabinets)
– Low-cost connectivity for assets that do not need high data rates
Typical NB-IoT use cases around charging sites
– Remote monitoring of cabinet door-open events and intrusion alarms
– Periodic reporting of site load, breaker state, or temperature sensors
– Asset tracking and maintenance alerts for distributed street infrastructure
– Simple availability beacons for low-complexity curbside assets
– Energy meter telemetry where readings are sent at intervals (e.g., every 15–60 minutes)
Benefits
– Strong coverage, including underground garages and dense urban environments
– Low device power consumption (useful for sensor nodes)
– Low ongoing data costs for small telemetry payloads
– Operates on licensed spectrum, typically offering stable network quality
Limitations and considerations
– Not ideal for full charger control where low latency and higher throughput are needed
– Firmware updates and detailed logs can be slow or impractical
– Depends on mobile operator NB-IoT support and roaming availability
– Device provisioning still requires SIM/eSIM management and lifecycle control
– Security must be designed properly (TLS, device authentication, topic/endpoint access control)
Related glossary terms
LTE modem
IoT
Telemetry
MQTT
Monitoring module
Remote diagnostics
Data encryption
Incident response plan
Load management
CPMS