Smart Energy Meter Case Study: 480 Mall Tenants Billed on Use

A shopping centre billed 480 tenants for electricity using floor area, and every quarter the disputes took longer to settle than the readings took to collect. The site wanted billing based on measured consumption, without asking the building IT team to open its network or its firewall. We supplied 480 DIN rail smart energy meters and seven gateways reporting over the mobile network. Installation finished in 26 days across 42 distribution boards, with no landlord supply interruption.

Project Snapshot

The Problem: Service Charges Nobody Could Defend

Area-based billing is simple until a tenant asks why a restaurant that trades eight hours a day pays the same rate per square metre as a cold store that runs compressors around the clock. Once a few tenants push back, the whole apportionment method becomes a negotiation, and every dispute costs the management company staff time it cannot bill for.

The site had also inherited a problem with arrears. When consumption is not measured, a tenant that stops paying is hard to isolate without cutting a supply that may serve neighbouring units.

Two technical constraints shaped the answer. First, meters had to fit inside distribution boards that were already full, so anything requiring extra cabinet space was out. Second, the building IT network was off limits. A solution that depended on the landlord's Wi-Fi or LAN would have stalled in a security review for months.

Why We Chose DIN Rail Meters With a Gateway Over Manual Reads, Wi-Fi Meters and Pulse Loggers

Manual reading. Excluded. The cost and the disputes both stay, and a monthly visit to 42 boards gives one reading a month rather than the interval a billing cycle needs.

Wi-Fi connected meters. Excluded. The building would have had to expose its network to third-party devices, which the IT policy did not allow.

Pulse loggers on existing meters. Excluded. They log a pulse output but cannot tell the platform about voltage, current or tamper events, and the older meters were not being replaced anyway.

DIN rail meters on a LoRa gateway with mobile uplink. Selected. Meters sit inside the existing boards, the gateway handles the radio side locally, and the uplink runs over the mobile network so the building network stays untouched.

The Metering System We Supplied

The estate needed two meter types. Retail units with three-phase supplies and heavy kitchen loads took three-phase DIN rail units, and smaller tenancies and common-area sub-circuits took single-phase units. Because both come from the same family, the register map is consistent across the site and the platform treats every point the same way.

Each meter sits on a DIN rail inside an existing board, with tamper-evident terminal covers. Readings and events travel by low-power radio to a local power data gateway, which collects the cluster and pushes it upstream over the mobile network. Seven gateways cover four trading levels, which keeps the radio hops short even through service corridors.

The cloud platform holds the tenant register, applies the site's tariff structure, and produces the monthly billing statements the management team issues. Because it also stores load curves, the team can see when a unit's consumption starts to drift.

Installation: How the Work Ran

Installation was planned around trading hours rather than against them.

Each distribution board was metered in one visit. The board was isolated, meters were mounted and wired, current transformers were fitted where the supply was too large for direct connection, and the circuits were re-energised before the next board was opened. Because the work happened in a single visit per board, tenants saw one short interruption each instead of weeks of partial shutdowns.

Commissioning followed in two passes. Each meter was checked against a reference load and matched to its tenant record, then the gateway was confirmed to be delivering the whole cluster to the platform. The last step was a full billing trial, running the platform output alongside the old area-based figures for one cycle so the finance team could see the difference before it went live. Our DIN rail installation notes cover the same sequence.

Testing and Quality Control

Every meter is tested before shipment, and the register map was issued against the site's own tenancy schedule rather than a drawing. On site, each installed point was verified with a known load, and the reading was compared with a portable reference meter.

The gateways were tested for signal margin at each location, not just at the first one, because service corridors attenuate radio unpredictably. The platform was then audited for missing intervals so that any meter that had never reported was found before billing started.

Results: What the Numbers Show

All 480 tenancies are now billed on measured consumption. The management team reads the estate from a desk instead of sending staff into 42 plant rooms, and the read cost per tenant for the year fell to a fraction of the previous manual routine.

Disputes dropped because the platform can show a tenant its own load curve, which ends the argument before it starts. Arrears are handled without entering the board, since the fee-control meter types in the range can be isolated remotely. The whole estate is served over one mobile uplink, so our metering range can be extended to new units without touching the building network.

What This Case Means for Your Project

Tenant metering is a records problem as much as a hardware problem. The meters are the easy part; the work is matching every point to a tenant, an area and a tariff, and agreeing that mapping before anything is installed.

If you manage a retail, office or mixed-use estate and want to bill on measured use, send us the tenancy schedule and a board survey. Our team will specify the meter mix, the gateway positions and the platform configuration, then quote and ship. You can also discuss your roll-out plan while the specification is still open.