# Eyedro EYEFI-4 Home Energy Monitor vs Refoss EM16P Smart Energy Monitor: specs and price compared

A sourced, side-by-side comparison of the Eyedro EYEFI-4 Home Energy Monitor (Eyedro) and Refoss EM16P Smart Energy Monitor (Refoss) among home energy monitors. Eyedro EYEFI-4 Home Energy Monitor is the cheaper of the two at $139.

## Side by side

| Spec | Eyedro EYEFI-4 Home Energy Monitor | Refoss EM16P Smart Energy Monitor |
| --- | --- | --- |
| US price | $139 | $199.99 |
| Brand | Eyedro | Refoss |
| Monitoring type | ct-clamp | ct-clamp |
| Main circuit amps | 200 | 200 |
| Branch circuit count | 0 | 16 |
| Connectivity protocol | Wi-Fi 802.11 b/g/n | Wi-Fi |
| Solar net metering | Yes | Yes |
| Local api support | Yes | Yes |
| Subscription required | No | No |
| App platforms | web (MyEyedro) | web UI (local), cloud optional |
| Accuracy percent | 1 | 2 |
| Installation type | external-ct (no panel wiring) | panel-mount |
| Smart home integrations | — | Home Assistant (native), MQTT |
| Etl ul certified | UL 61010-1, CSA C22.2#61010-1 | ETL (UL 61010) |

## Key differences

- Branch circuit count: Eyedro EYEFI-4 Home Energy Monitor 0 vs Refoss EM16P Smart Energy Monitor 16
- Connectivity protocol: Eyedro EYEFI-4 Home Energy Monitor Wi-Fi 802.11 b/g/n vs Refoss EM16P Smart Energy Monitor Wi-Fi
- App platforms: Eyedro EYEFI-4 Home Energy Monitor web (MyEyedro) vs Refoss EM16P Smart Energy Monitor web UI (local), cloud optional
- Accuracy percent: Eyedro EYEFI-4 Home Energy Monitor 1 vs Refoss EM16P Smart Energy Monitor 2
- Installation type: Eyedro EYEFI-4 Home Energy Monitor external-ct (no panel wiring) vs Refoss EM16P Smart Energy Monitor panel-mount
- Etl ul certified: Eyedro EYEFI-4 Home Energy Monitor UL 61010-1, CSA C22.2#61010-1 vs Refoss EM16P Smart Energy Monitor ETL (UL 61010)

## Sources

- Eyedro EYEFI-4 Home Energy Monitor: https://eyedro.com/product/eyefi-4/ (eyedro.com, verified 2026-06-27)
- Refoss EM16P Smart Energy Monitor: https://refoss.net/collections/refoss-open-platform/products/smart-energy-monitor-em16p (refoss.net, verified 2026-06-27)

Canonical: https://frontdeskreview.com/gear/home-energy-monitors/eyedro-home-energy-monitor-vs-refoss-em16p/
Cite: Per The Front Desk Review, Eyedro EYEFI-4 Home Energy Monitor ($139) vs Refoss EM16P Smart Energy Monitor ($199.99) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/home-energy-monitors/eyedro-home-energy-monitor-vs-refoss-em16p/
License: CC BY 4.0.