Device overview
Eastron SDM320C-LR is a single-phase DIN-rail multifunction energy meter with LoRaWAN communication. It is best understood as an installer-led metering device for switchboards, cabinets, IoT metering projects, and sub-metering work where long-range wireless telemetry is more useful than Wi-Fi or Ethernet.
The meter measures voltage, current, active power, frequency, power factor, maximum demand, active energy, reactive energy, and imported/exported energy. That makes it useful for consumption monitoring, solar import/export visibility, tenant or circuit sub-metering, and remote metering projects that already have a LoRaWAN network path.
Metering and installation
SDM320C-LR is a direct-connected 1P2W single-phase meter. Eastron lists 5 A rated current, 100 A maximum current, 0.25 A minimum current, and 20 mA starting current. Because it is direct-connected, it does not use external CT clamps; the circuit conductors pass through the meter terminals and the installation should be handled by a qualified electrician.
The device is designed for DIN-rail mounting inside a switchboard or cabinet. Eastron's user manual describes standard DIN-rail installation and notes that the meter should be protected by a suitably sized circuit breaker.
Accuracy and measurement type
For comparison filters, the important fields are accuracyClass, measurementType, and maxCurrentAmps. Eastron's official product page lists active energy as Class 1 under IEC 62053-21 and Class B under EN50470-3:2022, with reactive energy Class 2 under IEC 62053-23. The page also lists 100 A maximum direct current, so EnergyMeterHub stores maxCurrentAmps as 100 A.
This is not a CT-based monitor like many home energy monitors. It is a direct-connected single-phase meter, which can make it more precise and installation-specific, but less DIY-friendly than clamp-based systems.
Communication and integrations
The distinguishing feature is LoRaWAN communication. Eastron lists LoRaWAN Specification 1.0.2, Class C operation, automatic upload of up to 19 parameters, and regional frequency options such as EU868, AS923, and AU915. The meter itself is not an app-first Wi-Fi monitor and no Eastron cloud dependency was verified for basic metering.
EnergyMeterHub does not mark this device as supportsLocalApi because the reviewed official source set does not describe a direct local IP API, Modbus TCP endpoint, embedded web server, or Home Assistant-native integration. In practice, data can still be consumed by downstream systems if a compatible LoRaWAN gateway and network server expose the telemetry.
Solar and import/export use
The product page and manual support imported/exported active and reactive energy measurement. That makes SDM320C-LR relevant for single-phase solar import/export monitoring, but it is still only an energy meter. It is not a solar inverter, battery, EV charger, or gateway-only product.
Buying and source notes
Eastron's official product page provides specifications, official images, PDF download, and inquiry/contact routes. No direct public checkout price was verified during this review, so the purchase link is recorded as an official product/contact route rather than a priced store listing.