Shelly Pro 3EM 120A v2
#4 in Whole-homeFull review
A DIN-rail meter for installers and tinkerers who want local control and solar metering.
Amazon $154.99$154.99
The Shelly Pro 3EM 120A v2 is the better home energy monitor overall, rated 3.3 to 2.9. The Shelly Pro 3EM 120A v2 leads on local control, accuracy and warranty. The Emporia Vue 3 (no branch sensors) wins on circuits and value. The Emporia Vue 3 (no branch sensors) costs $55 less ($99.99 vs $154.99).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Emporia Vue 3 (no branch sensors)
#9 in Whole-homeFull review
The cheapest way into Emporia: whole-home numbers now, circuit sensors as you need them.
Amazon $99.99$99.99
Which should you buy?
- Choose the Shelly Pro 3EM 120A v2 for local control (local API, MQTT or hub, works without the cloud vs cloud app only), accuracy (claimed within ±1% vs claimed within ±2%) and warranty (3-year warranty vs 1-year warranty).
- Choose the Emporia Vue 3 (no branch sensors) for circuits (0 branch circuits included, up to 16 vs 0 branch circuits included, up to 3) and value ($99.99 vs $154.99).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every whole-home home energy monitor; a clear win is highlighted. How we rank explains each one.
| Factor weight | Shelly Pro 3EM 120A v2 | Emporia Vue 3 (no branch sensors) |
|---|---|---|
| Overall rating | 3.3/5 | 2.9/5 |
| Value 25% | 46 $154.99 | 71 $99.99 |
| Circuits 20% | 9 0 branch circuits included, up to 3 | 50 0 branch circuits included, up to 16 |
| Local control 20% | 70 local API, MQTT or hub, works without the cloud | 0 cloud app only |
| Accuracy 15% | 100 claimed within ±1% | 50 claimed within ±2% |
| Subscription 10% | 50 subscription terms not published (neutral score used) | 50 subscription terms not published (neutral score used) |
| Warranty 10% | 50 3-year warranty | 0 1-year warranty |
Specifications
| Shelly Pro 3EM 120A v2 | Emporia Vue 3 (no branch sensors) | |
|---|---|---|
| Monitoring | ||
| Branch circuits included | None in box (up to 3) | None in box (up to 16) |
| Most circuits supported | 3 | 16 |
| Mains CT rating | 120 A | 200 A |
| Electrical systems | 3-phase | Split-phase, 3-phase |
| Solar / net metering | Yes | Yes |
| Claimed accuracy | ±1% | ±2% |
| Connectivity | ||
| Connection | Wi-Fi, LAN, Bluetooth, Matter | 2.4 GHz Wi-Fi |
| Local API / MQTT / hub | Yes | No |
| Needs maker cloud | No | Yes |
| Build | ||
| Warranty | 3 years | 1 year |