Shelly Pro 3EM 400A
#8 in Whole-homeFull review
Only worth it if your service is above 120A and the 400A sensors are confirmed with the seller.
Amazon $329.99$329.99
The Shelly Pro 3EM 400A is the better home energy monitor overall, rated 3.0 to 2.1. The Shelly Pro 3EM 400A leads on warranty and circuits. The Shelly Pro 3EM 400A costs $425.01 less ($329.99 vs $755).
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.
Eyedro 3-Phase 1000A Rogowski (4 in.)
#14 in Whole-homeFull review
For large commercial three-phase services where rigid clamps will not fit around the conductors.
Amazon $755$755
Which should you buy?
- Choose the Shelly Pro 3EM 400A for warranty (5-year warranty vs 1-year warranty) and circuits (0 branch circuits included, up to 3 vs mains only).
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 400A | Eyedro 3-Phase 1000A Rogowski (4 in.) |
|---|---|---|
| Overall rating | 3.0/5 | 2.1/5 |
| Value 25% | 3 $329.99 | 0 $755 |
| Circuits 20% | 9 0 branch circuits included, up to 3 | 0 mains only |
| Local control 20% | 50 local control not published (neutral score used) | 0 cloud app only |
| Accuracy 15% | 100 claimed within ±1% | 50 accuracy not claimed (neutral score used) |
| Subscription 10% | 50 subscription terms not published (neutral score used) | 100 no subscription |
| Warranty 10% | 100 5-year warranty | 0 1-year warranty |
Specifications
| Shelly Pro 3EM 400A | Eyedro 3-Phase 1000A Rogowski (4 in.) | |
|---|---|---|
| Monitoring | ||
| Branch circuits included | None in box (up to 3) | None in box |
| Most circuits supported | 3 | - |
| Mains CT rating | - | 1,000 A |
| Electrical systems | 3-phase | 3-phase |
| Solar / net metering | Yes | Yes |
| Claimed accuracy | ±1% | - |
| Connectivity | ||
| Connection | Wi-Fi, LAN, Bluetooth | 2.4 GHz Wi-Fi and Ethernet |
| Local API / MQTT / hub | - | No |
| Needs maker cloud | - | Yes |
| Free of subscription | - | Yes |
| Build | ||
| Warranty | 5 years | 1 year |