TL;DR
- LoRaWAN is ideal for connecting remote, energy-limited infrastructure
- It drastically reduces installation and operational costs compared to traditional systems
- Real-world deployment in Tonga enabled control of over 50 water pumps without trenching
- Integration with solar systems helps align energy consumption with renewable generation
- LoRaWAN networks are secure, scalable, and adaptable to changing operational needs
In remote regions where access to reliable infrastructure is limited, deploying traditional wired control and monitoring systems can be both logistically difficult and cost-prohibitive. For island nations like Tonga, these challenges are amplified by geography, terrain, and energy constraints.
Enter LoRaWAN (low-power, long-range) wireless communication protocol purpose-built for IoT. For applications in water management, energy metering, and remote pump control, LoRaWAN offers a highly scalable and energy-efficient alternative to conventional systems. In this blog, we explore how this technology is transforming utility management, with real-world insights from Direct Control’s recent project with the Tonga Water Board.
What is LoRaWAN?
LoRaWAN (Long Range Wide Area Network) is a wireless communication protocol designed for low-power devices operating over long distances, perfect for Internet of Things (IoT) applications. It enables sensors, meters, and controllers to transmit small packets of data to a central gateway without the need for high-bandwidth or energy-hungry infrastructure.
Key characteristics
- Long range: Up to 14 km in rural environments
- Low power consumption: Devices can run for years on a single battery
- Low data rates: Ideal for transmitting sensor values like flow rates, pressure, or pump status
- Cost-effective: Requires minimal infrastructure and supports thousands of devices per network
In practical terms, this means you can deploy a network of smart devices in the middle of a field, on a rooftop, or inside a pump shed, without worrying about trenching cable or provisioning AC power.
The energy advantage
In traditional SCADA (Supervisory Control and Data Acquisition) environments, remote sites often require hardwired connectivity and continuous power, which dramatically increases installation and operating costs, especially in off-grid or semi-rural areas.
LoRaWAN flips that model on its head. Devices are designed to wake only when they need to transmit data, drastically reducing energy use. This is a critical advantage in areas where:
- Power is unreliable or solar-powered
- Sites are difficult to access regularly for maintenance
- Sustainable operations and low emissions are priorities
By minimising power demand at each site, LoRaWAN not only extends the lifespan of field devices but also aligns with broader energy management goals, including net-zero targets.
Real-world application
Monitoring 50+ remote pump sheds in Tonga
When the Tonga Water Board (TWB) sought to modernise their water distribution system on the island of Tongatapu, they faced a significant hurdle: how to connect and control over 50 remote pump sites, each housed in a small shed and scattered across the scrubland, with no reliable cabling or network.
Direct Control designed and deployed LoRaWAN-based control panels at each location, these panels provided:
- Remote pump control
- Run status and fault detection
- Flow and pressure readings via pulse counters and sensors
The beauty of this approach? No trenching. No rewiring. Just battery-powered devices and a reliable LoRaWAN signal. It turned a physically fragmented network into a smart, responsive system.
Network design: Building a LoRaWAN backbone
A critical piece of the puzzle was establishing a reliable backhaul to transport LoRaWAN data to TWB’s central control system. With support from local telecom provider Digicel, Direct Control implemented a LoRaWAN network covering the full operational zone, from the well fields to the reservoirs in Nuku’alofa.
At the core of the network:
- Gateways: These act as translators, receiving LoRaWAN signals and forwarding them via cellular connection to the cloud or central server.
- Coverage mapping: Strategic placement of gateways ensured full coverage without signal loss, despite rugged terrain.
- Security: Encrypted data transmission protects sensitive operational data.
This backbone eliminated the need for extensive infrastructure and made the system flexible, scalable, and resilient to future expansion.
LoRaWAN and smarter energy use
One of the most impactful benefits of using LoRaWAN was the ability to align pump operation with solar energy availability. TWB had recently installed a 400 kW solar plant with battery storage. With real-time visibility into pump statuses and reservoir levels, the system could now prioritise pump operation during solar generation hours, maximising the use of renewable energy and reducing reliance on grid electricity.
This sort of dynamic energy alignment is a hallmark of modern utility operations. By knowing when and how assets are consuming power, and by automating around energy availability, operators can achieve meaningful savings and improved sustainability.
Final thoughts
LoRaWAN is not just a communications technology, it’s a strategic enabler for modern infrastructure. Whether managing water, energy, HVAC, or other building systems, it offers an affordable, flexible, and scalable pathway to digitisation.
At Direct Control, we see LoRaWAN as a vital tool for unlocking smarter, cleaner, and more sustainable operations, especially in places where the traditional model doesn’t apply.
Read the case study here
