Communication Modes of IoT Solar Street Lights, Their Advantages and Disadvantages

1. NB-IoT (Top Choice for Municipal Street Lights at Present)

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장점

1. Excellent coverage: Base stations are widely available in cities, towns, villages and suburbs; no self-built gateways required, and devices connect to the network once powered on.

2. Easy deployment: Each street light can be embedded with an independent NB module without networking or signal relays. Every luminaire can be controlled separately via the cloud platform.

3. Convenient operation and maintenance: The cloud backend directly retrieves data from each street light, and faults are remotely reported automatically.

4. Low power consumption: Sleep current is at the microampere level, perfectly matching the low-power supply scenario of solar street lights.

5. Strong anti-interference performance: Stable communication unaffected by trees or cable shielding.

6. Secure data transmission: Encrypted transmission supported by telecom operators with device authentication, suitable for municipal engineering projects.

단점

1. Annual traffic fees apply: Each light requires an IoT SIM card with yearly subscription costs, leading to high long-term expenses for large-scale projects.

2. Unavailable in areas without cellular base stations: Not applicable in remote mountainous regions, deserts and signal-blind zones.

3. Extremely limited bandwidth: Only small messages can be transmitted; video or high-definition pictures are not supported.

4. Signal attenuation occurs in basements or dense woodlands, requiring signal amplifiers.

2. LoRa / LoRaWAN (For Parks, Rural Roads and Large-Scale PV Street Light Clusters)

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장점

1. No recurring traffic fees: Only gateways need IoT SIM cards, while individual light nodes incur no monthly charges, delivering much lower long-term costs for mass deployment compared with NB-IoT.

2. Long transmission distance: 3–5 km line-of-sight range, and 1–2 km in urban areas with obstructions, ideal for continuous street lighting along long roads.

3. Ultra-low power consumption: Minimal sleep power draw, fully compatible with solar power supply.

4. Independent network operation: No reliance on telecom base stations, usable in mountainous areas, mining zones and signal-free remote regions.

5. Large network capacity: A single gateway can connect hundreds to over a thousand street lights.

단점

1. Additional gateway installation required: Gateways need to be mounted every 1–2 km along roads, increasing hardware and construction costs.

2. Severe signal attenuation from obstructions: High-rise buildings, dense forests and mountains drastically shorten transmission distance.

3. Complex self-built network maintenance: Gateway failures disconnect all street lights along the corresponding road section, requiring regular gateway inspections.

4. Low data transmission rate, incapable of large-capacity data transmission.

5. Wireless frequency bands are subject to radio regulatory restrictions in some regions.

3. PLC Power Line Carrier (For Solar Street Lights with Auxiliary Mains Power and Old Street Light Renovation)

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장점

1. No wireless antennas or extra wiring required; communication runs on original power lines with neat appearance.

2. Immune to wireless interference and physical obstructions such as walls and trees.

3. No recurring communication fees, only one-time hardware investment.

4. Automatic networking for all street lights on the same circuit, simplifying construction.

단점

1. Poor performance for fully off-grid solar systems: Severe signal attenuation on DC photovoltaic circuits, only viable for street lights supported by auxiliary mains power.

2. Severe signal interference from inverters and frequency converters; solar controllers easily cause data packet loss.

3. Communication stability declines with longer cables and more connected loads.

4. Difficult fault troubleshooting: Interference at one point on the line disrupts communication for the entire section of street lights.

4. 4G / 5G (For Smart Multi-Function Poles Equipped with Cameras)

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장점

1. Sufficient bandwidth: Supports transmission of video, images, audio and large-screen data.

2. Independent network access for each light with wide coverage and low latency.

3. Enables remote high-definition monitoring and voice public address.

단점

1. High power consumption: Standby current of 4G/5G modules is substantial; solar street lights need oversized batteries for stable operation.

2. Expensive traffic fees, especially for video streaming with heavy data consumption.

3. High hardware cost; modules are far pricier than NB-IoT or LoRa modules.

4. Frequent disconnections in mountainous areas with weak cellular signals.

5. ZigBee (For Small-Scale Street Lights in Residential Quarters and Parks)

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장점

1. Extremely low module hardware cost.

2. Low power consumption, suitable for small courtyard solar lights.

3. Self-organizing network with signal forwarding between lights.

단점

1. Very short transmission range (30–80 meters), unsuitable for long municipal roads.

2. Poor signal penetration through walls and trees.

3. Network congestion and high latency when large numbers of nodes are connected.

4. Largely phased out for large municipal road projects; only used for small lighting systems in residential compounds and parks.

6. Bluetooth/BLE (For On-Site Debugging and Short-Range Maintenance)

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장점

1. Zero traffic cost; mobile phones can adjust light parameters on site.

2. Ultra-low hardware cost, integrated as standard on nearly all controllers.

단점

1. Transmission distance limited to 10–30 meters; cannot support remote cloud management.

2. Only serves as auxiliary on-site debugging, not a primary IoT remote communication channel.

7. Wi-Fi (For Scenic Spots and Short-Range Multi-Function Lights in Parks)

장점

단점

1. Excessively high power consumption, hard to sustain with solar power supply.

2. Short coverage range requiring large numbers of access points (APs).

3. Unstable network performance under outdoor temperature fluctuations and rainwater exposure.

   Only applicable to landscape lights in scenic areas with mains-powered nearby Wi-Fi access points, not for road solar street lights.

Comprehensive Comparison of All Communication Modes

선택 권장사항

1. Standard urban municipal solar street lights: Prioritize NB-IoT for simplest construction and maintenance.

2. Large-scale clustered solar street lights in rural areas with sparse cellular base stations: Adopt LoRaWAN to cut long-term traffic costs.

3. Retrofitted street lights with auxiliary mains power: PLC carrier communication is an optional solution.

4. Smart poles equipped with surveillance cameras and display screens: Deploy dual communication backup of 4G/5G + NB-IoT.

5. Bluetooth BLE is recommended as an auxiliary on-site debugging channel for all solutions.