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 circuits. The Square D Wiser Energy WISEREM wins on value. The Square D Wiser Energy WISEREM costs $80.04 less ($249.95 vs $329.99).
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.
Square D Wiser Energy WISEREM
#17 in Whole-homeFull review
For those who want appliance-level hints without wiring up every circuit; accuracy of detection varies.
Amazon $249.95$249.95
Which should you buy?
- Choose the Shelly Pro 3EM 400A for circuits (0 branch circuits included, up to 3 vs mains only).
- Choose the Square D Wiser Energy WISEREM for value ($249.95 vs $329.99).
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 400A | Square D Wiser Energy WISEREM |
|---|---|---|
| Overall rating | 3.0/5 | 2.1/5 |
| Value 25% | 3 $329.99 | 19 $249.95 |
| 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 400A | Square D Wiser Energy WISEREM | |
|---|---|---|
| Monitoring | ||
| Branch circuits included | None in box (up to 3) | None in box |
| Most circuits supported | 3 | - |
| Mains CT rating | - | 200 A |
| Electrical systems | 3-phase | Split-phase |
| Solar / net metering | 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 | - |