Home Energy Monitors Review
Shelly Pro 3EM Smart Energy Meter Review (2026)
DIN-rail, local-first WiFi/Bluetooth energy meter beloved by Home Assistant power users.
Our verdict: Worth a low-risk try
★★★★★
$110-$150 · Amazon return policy applies
Check Today's Price →At a glance
| Category | Home Energy Monitors |
|---|---|
| Our rating | ★★★★★ 4.3/5 |
| Price | $110-$150 |
| Availability | Check current price on Amazon |
| Returns | Standard Amazon return policy applies |
| Best for | Home Assistant and automation enthusiasts who demand local, cloud-free energy data. |
Our take
The Shelly Pro 3EM is a DIN-rail-mounted three-phase smart energy meter that measures accumulated energy plus instantaneous voltage, current, active, and apparent power per phase, with roughly 1% active-energy accuracy and 60 days of on-device historical data at one-minute resolution. Unlike cloud-tethered rivals, Shelly devices expose a robust local API and MQTT, making this the favorite of the home-automation and Home Assistant crowd who want data that never has to leave their network. It supports split-phase and three-phase setups and can be paired with add-on relays for contactor control. The DIN-rail form factor and electrical knowledge required for installation make it more of a prosumer/electrician product than a plug-and-play consumer gadget, but the local control and price are hard to beat.
What we like
- Strong local control via API and MQTT, no cloud required
- Compact DIN-rail form factor with per-phase metering
- Excellent Home Assistant and automation integration
- 60 days of on-device historical data
What to keep in mind
- DIN-rail mounting and three-phase focus are less beginner-friendly
- No device-level appliance detection
- App/ecosystem geared toward tinkerers, not casual users
Buy through Amazon and you're covered by their standard return policy. Check the live listing for today's price and real buyer reviews before you commit.
Sold on Amazon · Standard returns apply · Live price & reviews on the listing
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Frequently asked questions
Is Shelly Pro 3EM Smart Energy Meter worth it?
The Shelly Pro 3EM is a DIN-rail-mounted three-phase smart energy meter that measures accumulated energy plus instantaneous voltage, current, active, and apparent power per phase, with roughly 1% active-energy accuracy and 60 days of on-device historical data at one-minute resolu We weigh real-world usefulness against price, and we note the downsides honestly. Check the live price and recent customer reviews on Amazon before deciding — both can change.
Where can I buy Shelly Pro 3EM Smart Energy Meter?
Through Amazon, where the standard Amazon return policy applies. We link to the current listing so you always see up-to-date pricing and availability.
Who is Shelly Pro 3EM Smart Energy Meter best for?
Home Assistant and automation enthusiasts who demand local, cloud-free energy data.
Is Shelly Pro 3EM Smart Energy Meter the best in its category?
It's one we think is worth considering, but "best" depends on your needs and budget — compare it against the alternatives in our reviews before you buy.