Smart water metering on LoRaWAN — engineering deep dive.

15 years on a non-replaceable battery.

AMR water meters operate in environments where battery replacement is operationally impossible — sealed enclosures, buried installations, IP68 ratings that cannot be opened for servicing. The 15-year battery life expectation is a hard engineering constraint, not a marketing target.

Every component decision — flow sensor (ultrasonic vs mechanical), microcontroller (sleep current), radio (LoRaWAN vs NB-IoT vs eSIM), message schedule (daily vs hourly), and onboard storage (90-day buffer) — flows from the power budget that meets the 15-year target. Network design for the gateway side must accept that meters cannot retransmit aggressively.

• Sleep current <28 µA across full duty cycle
• Ultrasonic flow sensing — no moving parts, no wear, accuracy maintained
• Adaptive message schedule — daily by default, faster on event
• 90-day onboard buffer survives connectivity outages

Gateway placement at urban density.

LoRaWAN gateway coverage in dense urban environments is typically 2-5 km radius depending on building density and antenna placement. In open rural deployment areas — relevant for Jal Jeevan Har Ghar Jal networks — coverage extends to 10-15 km per gateway.

Network architecture decisions cover: gateway placement (rooftop vs tower), backhaul (fibre vs cellular), message scheduling (deterministic vs adaptive), and roaming (Cognecto-hosted vs operator-hosted). Each decision has battery, latency, and cost implications detailed in the reference design.

WATCO Odisha, Jal Jeevan Ayodhya, Ion Exchange.

The reference design has been deployed across three live customer environments — WATCO Odisha urban distribution (120 km network), Jal Jeevan Mission Ayodhya residential network, and Ion Exchange multi-site industrial water. Each deployment validated different aspects of the architecture: dense urban, residential rollout, and multi-tenant client operations.

The numbers behind the story.