Device Comparison
Shelly EM vs Shelly EM Gen3 vs Shelly Pro EM-50
Compare 3 energy meter options by installation fit, monitoring, local data access, source-checked specs, and buying context.
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Which To Choose
Start with the practical fit, then read the table.
Shelly EM
Best fit when single-phase, two-channel monitoring, solar import/export visibility, and local dashboards and Home Assistant.
Shelly EM Gen3
Best fit when single-phase monitoring, with two current measurement channels, solar import/export visibility, and local dashboards and Home Assistant.
Shelly Pro EM-50
Best fit when single-phase, two independent measurement channels on the same phase., solar import/export visibility, and local dashboards and Home Assistant.
Use this comparison when you are choosing between energy meter options and need to separate practical setup fit from headline specifications.
At A Glance
Key fit signals before the full table
A quick pass over the most decision-shaping details for each device in this featured comparison.
Shelly EM
- Phase
- Single-phase, two-channel monitoring
- Installation
- Wall box / electrical cabinet / near-appliance retrofit with external current transformers
- Measurement
- Single-phase two-channel CT energy meter
- Max current
- 80 A
Shelly EM Gen3
- Phase
- Single-phase monitoring, with two current measurement channels
- Installation
- Panel-mounted Wi-Fi energy monitor with external CT clamps
- Measurement
- Two-channel CT energy meter with import/export-capable measurements
- Max current
- 80 A
Shelly Pro EM-50
- Phase
- Single-phase, two independent measurement channels on the same phase.
- Installation
- DIN-rail mounted single-phase energy meter with external current transformers.
- Measurement
- CT-based two-channel single-phase energy meter with 4-quadrant / photovoltaic-ready import-export measurement.
- Max current
- 50 A
Before You Decide
Checks that matter before price.
- Confirm your supply type first: single-phase, split-phase, or three-phase.
- Decide whether DIN-rail wiring, CT clamps, or utility-meter access fits your switchboard.
- Choose between cloud convenience and local data access before comparing prices.
- For solar homes, make sure import, export, and load readings are measured at the right point.
| Install fit | |||
|---|---|---|---|
| Phase support | Single-phase, two-channel monitoring | Single-phase monitoring, with two current measurement channels | Single-phase, two independent measurement channels on the same phase. |
| Installation | Wall box / electrical cabinet / near-appliance retrofit with external current transformers | Panel-mounted Wi-Fi energy monitor with external CT clamps | DIN-rail mounted single-phase energy meter with external current transformers. |
| Measurement | Single-phase two-channel CT energy meter | Two-channel CT energy meter with import/export-capable measurements | CT-based two-channel single-phase energy meter with 4-quadrant / photovoltaic-ready import-export measurement. |
| Max current | 80 A | 80 A | 50 A |
| Nominal voltage | Unknown | 110-240 V AC | 100-260 V AC |
| Meter fit | |||
| Accuracy class | Voltage +/-2%; current +/-2% from 1-50 A and +/-5% below 1 A | Voltmeter accuracy ±2%; ammeter accuracy ±2% from 1-50 A and ±5% below 1 A | Class B active energy (IEC 62053-21); Shelly states 1% measurement accuracy. |
| Current sensing | 1 x 50A CT included; supports up to 2 CTs total, with optional additional CT50A or CT80A | Up to 2 CT inputs; CT 50A included, CT 80A supported. | Two CT inputs (IA and IB) for current measurement; Shelly Pro EM-50 uses 0-50 A CT channels on the same phase. |
| Gateway fit | |||
| Connectivity | Unknown | Unknown | Ethernet, Wi-Fi, Bluetooth |
| Monitoring | |||
| Protocol | Wi-Fi / Bluetooth / MQTT / HTTP / WebSocket / RPC | Wi-Fi / Bluetooth / MQTT / HTTP / WebSocket / RPC | Wi-Fi / Ethernet / Bluetooth / MQTT / WebSocket / HTTPS / UDP / Modbus TCP |
| Local API | Yes | Yes | Yes |
| Cloud dependency | Optional cloud; can run locally over Wi-Fi with an embedded web interface and local protocols including MQTT, WebSocket, HTTP, and RPC. | Optional cloud; local web interface, scripting, RPC, MQTT, and WebSocket are available. | Optional Shelly Cloud; local LAN/Wi-Fi/Ethernet operation is available via embedded web UI, MQTT, HTTP/RPC, WebSocket, scripting, and Modbus TCP. |
| Home Assistant | Yes | Yes | Yes |
| Solar fit | |||
| Solar import/export | Yes | Yes | Yes |
| Buying context | |||
| Price range | Unknown | About $50-$90 | About EUR 84.90 / USD 119.99 from Shelly official stores during the 2026-05 review |
| Availability | EU store / USA store / region-dependent Shelly availability | US, EU, UK, Global | United States via Shelly USA official store; broader regional availability varies through Shelly channels and local resellers. |
| Source check | |||
| Last verified | Jun 18, 2026 | Jun 19, 2026 | Jun 19, 2026 |
| Product page | Official page | Official page | Official page |
| Documentation | Official docs | Official docs | Official docs |
Verdict
Start with Shelly EM when single-phase, two-channel monitoring, solar import/export visibility, and local dashboards and Home Assistant. Put Shelly EM Gen3 higher on the list when single-phase monitoring, with two current measurement channels, solar import/export visibility, and local dashboards and Home Assistant. For the final choice, check the full table for installation constraints, local data access, and source-verified unknowns.
FAQ
Common decision questions.
Which energy meter should I choose?
Choose the option that matches your installation constraints and data path first. For 3 energy meter options, the full table is most useful after you know whether local data access, cloud convenience, backup behavior, solar visibility, or expansion matters most.
What should I check before comparing prices?
Check installation fit, required accessories, official documentation, monitoring platform support, and any unknown fields in the source-checked table. Price is only useful once those constraints are clear.
Can these devices work with local dashboards or Home Assistant?
Shelly EM, Shelly EM Gen3, Shelly Pro EM-50 list Home Assistant support in the catalog. Shelly EM, Shelly EM Gen3, Shelly Pro EM-50 are marked with local API support. Confirm firmware, region, and integration maturity before treating this as a final compatibility guarantee.
Are unknown fields a reason to avoid a device?
Not always. Unknown means the field was not confirmed from the reviewed source data. Treat it as a question for the installer, reseller, or manufacturer before making a purchase decision.