Shelly
Shelly 3EM Smart 3-Phase Energy Meter
$121.49Cheaper
Best Home Energy Monitors · head-to-head
Shelly 3EM Smart 3-Phase Energy Meter vs Generac PWRview Home Energy Monitor W2HEM
A sourced, side-by-side comparison. Shelly 3EM Smart 3-Phase Energy Meter is cheaper at $121.49. Every spec and price links to its source.
Generac
Generac PWRview Home Energy Monitor W2HEM
$219.99
Which is better: the Shelly 3EM Smart 3-Phase Energy Meter or Generac PWRview Home Energy Monitor W2HEM?
On the specs we track, they're closely matched. The Shelly 3EM Smart 3-Phase Energy Meter is the cheaper at $121.49.
See Shelly 3EM Smart 3-Phase Energy Meter on Amazon See Generac PWRview Home Energy Monitor W2HEM on Amazon
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Shelly 3EM Smart 3-Phase Energy Meter | Generac PWRview Home Energy Monitor W2HEM |
|---|---|---|
| US price | $121.49 | $219.99 |
| Brand | Shelly | Generac |
| Released | — | — |
| Monitoring type | ct-clamp | ct-clamp |
| Main circuit amps | 120 | 264 |
| Branch circuit count | 0 | 0 |
| Connectivity protocol | Wi-Fi 802.11 b/g/n | Wi-Fi 802.11 b/g/n |
| Solar net metering | Yes | Yes |
| Local api support | Yes | — |
| Subscription required | No | — |
| App platforms | iOS, Android, web | iOS, Android |
| Accuracy percent | — | 1 |
| Installation type | din-rail | panel-mount |
| Smart home integrations | Home Assistant, Alexa, Google Home, MQTT, CoAP, REST API | — |
| Etl ul certified | — | UL/CSA 61010-1 |
Sources — Shelly 3EM Smart 3-Phase Energy Meter: us.shelly.com (verified 2026-06-27). Generac PWRview Home Energy Monitor W2HEM: norwall.com (verified 2026-06-27).
What's the difference between the Shelly 3EM Smart 3-Phase Energy Meter and Generac PWRview Home Energy Monitor W2HEM?
Where the two actually differ on the specs we track (3 of 12). Matching specs are omitted.
- Main circuit amps: Shelly 3EM Smart 3-Phase Energy Meter 120 vs Generac PWRview Home Energy Monitor W2HEM 264
- App platforms: Shelly 3EM Smart 3-Phase Energy Meter iOS, Android, web vs Generac PWRview Home Energy Monitor W2HEM iOS, Android
- Installation type: Shelly 3EM Smart 3-Phase Energy Meter din-rail vs Generac PWRview Home Energy Monitor W2HEM panel-mount
What reviewers say
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
Shelly 3EM Smart 3-Phase Energy Meter
No sourced tester review yet.
Generac PWRview Home Energy Monitor W2HEM
Only one whitelisted tester, NYT Wirecutter, covers the Generac PWRview W2 (W2HEM), and only qualitatively: it was a former pick now dropped for poor availability and never lab-measured. Wirecutter says it uses machine learning like Sense and suits homes already in Generac's solar and battery ecosystem. No hands-on measurements exist. (1 sourced review.)
Praised: Uses machine learning to identify where the home draws power, similar to Sense; Optimized to integrate with Generac solar panels and storage batteries; worth considering for existing Generac-ecosystem owners.
Flagged: Hard to find / limited availability; removed from Wirecutter's picks and no longer listed on Generac's site.