Shelly Pro 3EM 120A
#3 in Whole-homeFull review
The first-generation Pro 3EM with a longer warranty; buy the v2 if you want Matter.
Amazon $153.33$153.33
The Shelly Pro 3EM 120A is the better home energy monitor overall, rated 3.4 to 2.0. The Shelly Pro 3EM 120A leads on value and circuits. The Shelly Pro 3EM 120A costs $171.67 less ($153.33 vs $325).
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.
Square D Wiser Energy Solar WISEREMPV
#18 in Whole-homeFull review
The solar edition of the Wiser Energy monitor, for homes with panels.
Amazon $325$325
Which should you buy?
- Choose the Shelly Pro 3EM 120A for value ($153.33 vs $325) 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 120A | Square D Wiser Energy Solar WISEREMPV |
|---|---|---|
| Overall rating | 3.4/5 | 2.0/5 |
| Value 25% | 47 $153.33 | 4 $325 |
| 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) | 50 subscription terms not published (neutral score used) |
| Warranty 10% | 100 5-year warranty | 0 warranty not published, scored as none |
Specifications
| Shelly Pro 3EM 120A | Square D Wiser Energy Solar WISEREMPV | |
|---|---|---|
| Monitoring | ||
| Branch circuits included | None in box (up to 3) | None in box |
| Most circuits supported | 3 | - |
| Mains CT rating | 120 A | 200 A |
| Electrical systems | 3-phase | Split-phase |
| Solar / net metering | Yes | Yes |
| Claimed accuracy | ±1% | - |
| Connectivity | ||
| Connection | Wi-Fi, LAN, Bluetooth | Wi-Fi |
| Local API / MQTT / hub | - | No |
| Needs maker cloud | - | Yes |
| Build | ||
| Warranty | 5 years | - |