Energy Monitors

SONOFF POWCT Smart Power Meter Review

By Gene Published How I research
SONOFF POWCT Smart Power Meter Review
★★★★☆
Price
$35–$45
Best For
Budget buyers who want to watch one appliance circuit, like a water heater or AC.

Check Price on Amazon

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Key Takeaways

  • Best for: Watching one appliance circuit on a budget
  • Standout: Under $45 with a 100A split-core clamp
  • Watch out: One wire only, not whole-home
  • Not for: Anyone wanting per-circuit data across the house

The SONOFF POWCT is a small DIN-rail power meter with one 100A split-core clamp. It shows what a single circuit, like a water heater or AC, is using in the eWeLink app, and keeps six months of data. It sells for about $35 to $45.

What you need before you buy

  • An electrician: the clamp goes around a wire inside the panel and the meter needs a wired power feed.
  • 2.4GHz Wi-Fi at the panel.
  • A contactor only if you want it to switch the load.

What you can track

Live power, daily and monthly energy for one circuit, with usage history you can export. Set alerts or schedules in eWeLink, or use Alexa or Google Home routines.

How it compares

SONOFF POWCT Shelly EM Gen3 Emporia Vue 3
Typical price $35–$45 $65–$75 $100–$200
Sensors 1 x 100A clamp 2 channels (one 50A clamp included) Mains + up to 16 circuits
Connects via 2.4GHz Wi-Fi Wi-Fi Wi-Fi
Solar tracking Yes Yes Yes
Best for One appliance on a budget Budget, simple setup Per-circuit detail

See my Shelly EM Gen3 and Emporia Vue 3 reviews.

Want to see other Energy Monitors? Compare them side by side →

How I researched this: SONOFF’s POWCT product page and manual, the Amazon listing, and a hands-on video from Csongor Varga. Prices checked October 30, 2026.

SONOFF POWCT Smart Power Meter

The SONOFF POWCT watches one circuit with a 100A clamp for under $45, and can switch a load through a contactor. Here is who it suits.

Product Brand: SONOFF

Editor's Rating:
4

Pros

  • The cheapest way on our list to watch one circuit, at about $35 to $45
  • Split-core 100A clamp opens and closes without touching live wire
  • Keeps up to 6 months of usage data and exports it to a file
  • Dry-contact output can drive a contactor to switch a load
  • Works with Alexa and Google Home through the eWeLink app

Cons

  • Watches one wire, so it is not a whole-home monitor
  • 2.4GHz Wi-Fi only
  • Readings on 240V appliances need a sanity check against your bill
  • The eWeLink app is basic next to Emporia or Shelly

Specs

ModelSONOFF POWCT
Sensor1 x 100A split-core current clamp
DataReal-time power and energy, 6 months stored, exportable
Switching2A dry-contact output for an external contactor
Connectivity2.4GHz Wi-Fi
AppeWeLink; works with Alexa and Google Home
MountingDIN rail
SafetySurge, lightning and short-circuit tested

Verdict

For under $45, the POWCT is a cheap way to see what one big appliance costs to run. It only watches one wire, so if you want your whole home or several circuits, spend more on the Shelly EM Gen3 or Emporia Vue 3.

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Common Questions

Can it track my whole house?
Not really. It has one clamp, so it reads one wire. US homes have two main legs, so you would see only part of your usage.
Do I need an electrician?
Yes. The clamp goes around a wire inside your panel and the meter needs a wired power feed. Have a licensed electrician install it.
Does it work with Alexa or Google?
Yes, through the eWeLink app, and it can also run in Home Assistant with a community integration.