India has over 350 million electricity meters. Fewer than 5 percent are smart. The government's Smart Meter National Programme (SMNP) targets 250 million smart meters by 2030, but the pace of replacement is slow. Discoms are stretched thin. Capital budgets are limited. And ripping out working meters to install new ones is expensive, disruptive, and wasteful.
There is a better approach. Instead of replacing meters, you can convert existing electric meters into smart meters by attaching a low-cost IoT node and connecting them through a wireless network. The network does the heavy lifting — collecting readings from every meter in a society or campus, funneling them to a master gateway, and pushing the data to the cloud for billing, analytics, and demand management.
The question is: which wireless network should you use? Three technologies dominate this space — LPWAN (specifically LoRaWAN), WiFi mesh, and Bluetooth mesh. Each uses a master-slave (or coordinator-node) architecture where a central gateway collects data from dozens or hundreds of meter nodes. But the similarities end there. Cost, range, latency, power consumption, and scalability differ dramatically.
This guide breaks down all three so you can pick the right one for your deployment.
How master-slave meter reading works
Before comparing technologies, it helps to understand the common architecture. In all three models, the setup looks like this.
Every electric meter gets a small wireless IoT node attached to it. This node reads the meter (via pulse output, optical port, or RS485 interface) and transmits the reading wirelessly. A master device — called a gateway, coordinator, or concentrator depending on the technology — sits centrally in the society or building. It collects readings from all meter nodes within its range. The master then forwards the aggregated data to a cloud platform via cellular (4G/5G), Ethernet, or broadband WiFi.
The cloud platform validates readings, stores time-series data, generates bills, detects anomalies like theft or faulty meters, and provides dashboards. The Akran IQ platform handles this entire backend — ingestion, validation, storage, billing API, and cognitive analytics — so you focus on the network, not the software.
Now let us compare the three network technologies that connect the meter nodes to the master gateway.
LPWAN (LoRaWAN): the long-range, low-power option
LoRaWAN is purpose-built for exactly this use case. It was designed from the ground up for low-power devices that send small packets of data at long range. Meter reading is its sweet spot.
In a LoRaWAN deployment, each meter node has a LoRa radio module (costing Rs 150 to Rs 400) that transmits readings to a LoRaWAN gateway. The gateway can be mounted on a rooftop or utility pole. A single gateway covers 2 to 5 kilometers in dense urban areas and up to 15 kilometers in open rural areas. For a typical housing society with 200 to 2,000 flats, one gateway handles everything.
Power consumption is remarkably low. A LoRaWAN meter node sending readings every 15 minutes draws so little power that a single AA lithium battery lasts 5 to 8 years. This means no wiring, no external power supply, and no maintenance visits to change batteries for years.
Latency is the trade-off. LoRaWAN is not real-time. A single uplink transmission takes 50 to 200 milliseconds, but the network operates on a duty-cycle model. Nodes transmit at scheduled intervals (typically every 15 minutes for metering) and the gateway processes them sequentially. End-to-end latency from meter read to cloud is 1 to 30 seconds depending on network load. For billing and energy monitoring, this is more than adequate.
The data rate is low — 0.3 to 27 kbps depending on the spreading factor. But a meter reading is tiny: 20 to 50 bytes. You do not need bandwidth. You need reliability and range, which LoRaWAN delivers.
Cost per meter node (hardware): Rs 800 to Rs 1,500. LoRaWAN gateway: Rs 15,000 to Rs 50,000 depending on the model. For a 500-meter society, the total network cost is roughly Rs 4.5 to Rs 8 lakhs including the gateway, or Rs 900 to Rs 1,600 per meter all-in.
WiFi mesh: the bandwidth-rich, power-hungry option
WiFi mesh uses standard 802.11 (WiFi) radios arranged in a mesh topology where each node can relay data for other nodes. In a smart metering context, each meter node has a WiFi radio that communicates with nearby nodes, and data hops through the mesh until it reaches a root node (the master) connected to the internet.
The advantage of WiFi mesh is bandwidth. You get 10 to 100 Mbps throughput per hop, which is massive overkill for meter readings but useful if you want to add cameras, display panels, or other high-bandwidth devices to the same network later. Latency is low — 5 to 50 milliseconds per hop, giving you near-real-time readings.
WiFi mesh also uses familiar infrastructure. Your society's IT team already understands WiFi. There are no new protocols to learn, no specialized gateways to configure, and diagnostic tools are readily available.
The problems start with power and range. A WiFi radio draws 100 to 300 milliwatts when transmitting — roughly 50 to 100 times more than LoRaWAN. Battery operation is impractical. Every meter node needs a wired power supply, which adds installation cost and complexity. In a society where meters are in a central meter room on each floor, wired power is usually available. In a campus with distributed meters on poles or in outdoor enclosures, wiring every node is expensive.
Range per node is 30 to 50 meters indoors and 100 to 150 meters outdoors. In a large society, you need many nodes to form a mesh that covers every meter. Each hop adds latency and reduces throughput. A mesh with 5 to 8 hops becomes unreliable without careful RF planning.
Cost per meter node (hardware): Rs 1,200 to Rs 2,500. WiFi mesh root node / gateway: Rs 5,000 to Rs 15,000. But you also need power at every node and potentially more nodes for coverage. For a 500-meter society across 10 buildings, total network cost is Rs 7 to Rs 15 lakhs including wiring, or Rs 1,400 to Rs 3,000 per meter all-in.
Bluetooth mesh: the short-range, high-density option
Bluetooth mesh (based on Bluetooth Low Energy, BLE 5.0+) is designed for building-scale networks. It uses a managed flood or directed forwarding mesh where every node can relay messages. A Bluetooth mesh network can theoretically support up to 32,767 nodes, making it suitable for dense deployments.
For smart metering, each meter gets a BLE mesh node that reads the meter and transmits data. Messages hop from node to node through the mesh until they reach a gateway (called a Proxy node in Bluetooth mesh terminology) connected to the internet.
Power consumption sits between LoRaWAN and WiFi. A BLE mesh node transmitting every 15 minutes draws around 5 to 15 milliwatts average, allowing battery life of 2 to 4 years on a coin cell or small lithium battery. Not as good as LoRaWAN, but workable for indoor meter rooms where battery replacement is easy.
Range per node is 10 to 30 meters indoors and 50 to 100 meters outdoors. This is shorter than both WiFi and LoRaWAN. But because every node is a relay, the mesh extends range organically. In a society where meters are concentrated in meter rooms on each floor, the nodes are close enough to form a reliable mesh. In a spread-out campus, you may need dedicated relay nodes to bridge gaps.
Latency depends on hop count. Each hop adds 10 to 50 milliseconds. In a typical society with 3 to 5 hops from the farthest meter to the gateway, end-to-end latency is 50 to 250 milliseconds — better than LoRaWAN but worse than direct WiFi.
Data rate is 1 to 2 Mbps (BLE 5.0), but effective throughput in a mesh is much lower due to relaying overhead. For meter readings (20 to 50 bytes every 15 minutes), this is not a constraint.
Cost per meter node (hardware): Rs 400 to Rs 1,000. BLE mesh gateway / Proxy node: Rs 3,000 to Rs 10,000. For a 500-meter society, total network cost is Rs 2.5 to Rs 6 lakhs, or Rs 500 to Rs 1,200 per meter all-in. This makes Bluetooth mesh the cheapest option by hardware cost.
Head-to-head comparison
Here is how the three technologies stack up across the parameters that matter for society-level smart metering.
Range per node: LoRaWAN wins decisively at 2 to 5 km urban. WiFi mesh covers 30 to 150 m per node. Bluetooth mesh covers 10 to 100 m per node. For a single housing society, all three can work, but LoRaWAN can cover an entire township with one gateway.
Latency (end-to-end): WiFi mesh is fastest at 5 to 50 ms. Bluetooth mesh is moderate at 50 to 250 ms. LoRaWAN is slowest at 1 to 30 seconds. For billing and monitoring, all three are acceptable. For real-time demand response, WiFi mesh has an edge.
Power consumption: LoRaWAN is the clear winner — 5 to 8 years on battery. Bluetooth mesh offers 2 to 4 years. WiFi mesh requires wired power, ruling out battery operation entirely.
Cost per meter (all-in): Bluetooth mesh is cheapest at Rs 500 to Rs 1,200. LoRaWAN is mid-range at Rs 900 to Rs 1,600. WiFi mesh is most expensive at Rs 1,400 to Rs 3,000 due to wiring requirements.
Scalability: LoRaWAN scales to thousands of meters per gateway across kilometers. Bluetooth mesh scales to thousands of nodes per network but only within building range. WiFi mesh degrades beyond 50 to 100 nodes due to hop congestion and interference.
Connectivity reliability: LoRaWAN uses licensed-exempt sub-GHz bands (865-867 MHz in India) with excellent building penetration. WiFi mesh operates on crowded 2.4/5 GHz bands shared with every router, phone, and microwave in the society. Bluetooth mesh uses 2.4 GHz but with adaptive frequency hopping that reduces interference.
Infrastructure needed: LoRaWAN needs one gateway per society, often mounted on the terrace. WiFi mesh needs a root node plus wired power at every meter point. Bluetooth mesh needs one or two proxy gateways per building and optionally a few relay nodes.
Which technology for which deployment
The right choice depends on your deployment scenario.
Large housing society (500+ flats, multiple towers): LoRaWAN. One gateway on the terrace covers every meter across all towers. Battery-powered nodes mean zero wiring. The Akran IQ platform ingests LoRaWAN data natively via MQTT and provides per-flat billing dashboards to the RWA.
Single apartment building (50 to 200 flats, central meter room per floor): Bluetooth mesh. Meters are physically close, so short range is not a problem. Cost per meter is lowest. Battery life is adequate for indoor installations. The BLE proxy gateway on each floor connects to a building-level controller.
Commercial campus with existing WiFi infrastructure: WiFi mesh. If the campus already has enterprise WiFi with PoE switches, adding meter nodes to the existing mesh is straightforward. The bandwidth headroom allows combining metering with security cameras, environmental sensors, and building management on a single network.
Rural or semi-urban multi-society township: LoRaWAN without question. The 5 to 15 km range means one gateway serves an entire township. Battery operation is essential where wired power to meter locations is unavailable. This is the architecture that scales from hundreds to hundreds of thousands of meters.
Retrofitting societies that already have smart home hubs: Bluetooth mesh. Many modern societies have BLE-based home automation. Adding meter nodes to an existing BLE mesh network avoids deploying a parallel communication layer.
Real-world deployment: 1,200-meter society in Noida
We deployed a LoRaWAN-based smart metering network for a residential society in Noida with 1,200 flats across 12 towers. The setup included one LoRaWAN gateway on Tower 6 rooftop (central location), 1,200 pulse-counter IoT nodes attached to existing digital meters, and the Akran IQ platform for data collection, billing, and anomaly detection.
Total hardware cost was Rs 14.4 lakhs (Rs 1,200 per meter including gateway cost amortized). Installation took 3 weeks with a team of 4 technicians. The society now gets automated monthly bills with 99.7 percent reading accuracy, eliminating manual meter reading for 1,200 flats. Within 60 days, the system flagged 23 meters with abnormal consumption patterns — 8 of which turned out to be actual cases of power theft the RWA had never detected.
The cognitive layer identifies load patterns per tower and predicts transformer stress during peak summer months, helping the society avoid DG overload charges from the discom.
Cost comparison: technology vs manual reading
Manual meter reading for a 500-flat society costs approximately Rs 25,000 to Rs 40,000 per month (meter readers, data entry, dispute resolution). That is Rs 3 to Rs 4.8 lakhs per year.
A LoRaWAN smart meter network for the same society costs Rs 5 to Rs 8 lakhs one-time with annual cloud platform costs of Rs 50,000 to Rs 1 lakh. Payback period: 12 to 18 months. After that, the society saves Rs 2 to Rs 4 lakhs every year.
A Bluetooth mesh network costs even less upfront — Rs 2.5 to Rs 6 lakhs — but may need battery replacements every 3 to 4 years. A WiFi mesh network costs more upfront due to wiring but has near-zero maintenance if the society already has PoE infrastructure.
All three are cheaper than replacing meters entirely with commercial smart meters, which would cost Rs 30 to Rs 80 lakhs for a 500-meter society at Rs 6,000 to Rs 16,000 per smart meter.
How to get started
Start with a pilot on one tower or one building. Pick the technology that matches your physical layout: LoRaWAN for spread-out societies, Bluetooth mesh for compact buildings, WiFi mesh for campuses with existing infrastructure.
Retrofit your existing meters with IoT nodes. Connect them to the Akran IQ platform. Run the pilot for 30 days. Compare automated readings against manual readings. You will have the data to build a business case for the full rollout.
Need help choosing the right network architecture for your society or campus? Talk to our team. We have deployed smart metering networks across housing societies, industrial parks, and commercial campuses using all three technologies.