Emporia Vue 3 vs Shelly Pro EM-50

Shelly Pro EM-50 wins on measurement quality and integration: ±1% Class B accuracy, Ethernet, Modbus TCP, MQTT, a local web interface, a built-in switching contact and a 3 year warranty, for less money. Emporia Vue 3 wins on scope, with 19 channels and 16 branch clamps in the box, so it is the only one of the two that maps an entire panel breaker by breaker.

Channel count. Emporia Vue 3 clamps the mains plus up to 16 individual circuits, while Shelly Pro EM-50 measures two channels on a single phase with its two included 50 A CTs. Everything else follows from that: the Emporia is a whole-panel dashboard, the Shelly is a precise instrument for a specific feed or appliance.

Shelly Pro EM-50, rated at ±1% (Accuracy Class B for active energy from 5 A to 50 A) and it also reports power factor, apparent power, frequency and voltage. Emporia Vue 3 is specified at ±2% and does not report power factor, which is fine for spotting waste and comparing months but less suitable when the numbers need to be defensible.

Shelly Pro EM-50 does. It stores at least 60 days of one-minute data on board and can be read over the LAN through its web interface, RPC, MQTT or Modbus TCP, with wired Ethernet as a backup to Wi-Fi. Emporia Vue 3 has no local API or web interface and no local storage, so it needs an active internet connection.

Yes, in different ways. Emporia Vue 3 does bi-directional net metering per sensor and offers excess-solar, peak-demand and time-of-use automations in its app. Shelly Pro EM-50 does four quadrant measurement with a returned-energy counter and can divert surplus PV production directly, since its potential-free contact drives a contactor.

Anyone who wants to see which breakers cost the most money without adding a device per circuit. It ships with 16 branch sensors and a 200 A main CT, supports split-phase and three-phase panels, tracks cost and time-of-use rates, and asks for no subscription. The trade is a cloud-only platform and a 1 year warranty, where Shelly Pro EM-50 gives 3 years and full local access.