# Refoss EM16P Smart Energy Monitor vs Shelly 3EM Smart 3-Phase Energy Meter: specs and price compared

A sourced, side-by-side comparison of the Refoss EM16P Smart Energy Monitor (Refoss) and Shelly 3EM Smart 3-Phase Energy Meter (Shelly) among home energy monitors. Shelly 3EM Smart 3-Phase Energy Meter is the cheaper of the two at $121.49.

## Side by side

| Spec | Refoss EM16P Smart Energy Monitor | Shelly 3EM Smart 3-Phase Energy Meter |
| --- | --- | --- |
| US price | $199.99 | $121.49 |
| Brand | Refoss | Shelly |
| Monitoring type | ct-clamp | ct-clamp |
| Main circuit amps | 200 | 120 |
| Branch circuit count | 16 | 0 |
| Connectivity protocol | Wi-Fi | Wi-Fi 802.11 b/g/n |
| Solar net metering | Yes | Yes |
| Local api support | Yes | Yes |
| Subscription required | No | No |
| App platforms | web UI (local), cloud optional | iOS, Android, web |
| Accuracy percent | 2 | — |
| Installation type | panel-mount | din-rail |
| Smart home integrations | Home Assistant (native), MQTT | Home Assistant, Alexa, Google Home, MQTT, CoAP, REST API |
| Etl ul certified | ETL (UL 61010) | — |

## Key differences

- Main circuit amps: Refoss EM16P Smart Energy Monitor 200 vs Shelly 3EM Smart 3-Phase Energy Meter 120
- Branch circuit count: Refoss EM16P Smart Energy Monitor 16 vs Shelly 3EM Smart 3-Phase Energy Meter 0
- Connectivity protocol: Refoss EM16P Smart Energy Monitor Wi-Fi vs Shelly 3EM Smart 3-Phase Energy Meter Wi-Fi 802.11 b/g/n
- App platforms: Refoss EM16P Smart Energy Monitor web UI (local), cloud optional vs Shelly 3EM Smart 3-Phase Energy Meter iOS, Android, web
- Installation type: Refoss EM16P Smart Energy Monitor panel-mount vs Shelly 3EM Smart 3-Phase Energy Meter din-rail
- Smart home integrations: Refoss EM16P Smart Energy Monitor Home Assistant (native), MQTT vs Shelly 3EM Smart 3-Phase Energy Meter Home Assistant, Alexa, Google Home, MQTT, CoAP, REST API

## Sources

- Refoss EM16P Smart Energy Monitor: https://refoss.net/collections/refoss-open-platform/products/smart-energy-monitor-em16p (refoss.net, verified 2026-06-27)
- Shelly 3EM Smart 3-Phase Energy Meter: https://us.shelly.com/products/shelly-3em (us.shelly.com, verified 2026-06-27)

Canonical: https://frontdeskreview.com/gear/home-energy-monitors/refoss-em16p-vs-shelly-3em/
Cite: Per The Front Desk Review, Refoss EM16P Smart Energy Monitor ($199.99) vs Shelly 3EM Smart 3-Phase Energy Meter ($121.49) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/home-energy-monitors/refoss-em16p-vs-shelly-3em/
License: CC BY 4.0.