Device Comparison
Shelly Pro 3EM vs Shelly Pro 3EM-3CT63 vs Shelly Pro 3EM-400 vs SMA Energy Meter
A solar-aware three-phase meter comparison for buyers balancing Shelly local flexibility against SMA ecosystem alignment.
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Which To Choose
Start with the practical fit, then read the table.
Shelly Pro 3EM
Best fit when single-phase or three-phase installations, solar import/export visibility, and local dashboards and Home Assistant.
Shelly Pro 3EM-3CT63
Best fit when single-phase or three-phase installations., solar import/export visibility, and local dashboards and Home Assistant.
Shelly Pro 3EM-400
Best fit when three-phase or single-phase installations; supports multiple connection types and phase-sequence detection., solar import/export visibility, and local dashboards and Home Assistant.
SMA Energy Meter
Best fit when uS split-phase; 208 V with added third CT; not 3-phase 480 V., solar import/export visibility, and local data access.
Use this comparison when the site needs a three-phase meter and the real choice is between flexible Shelly Pro hardware and a meter designed to sit more naturally inside an SMA solar system.
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 Pro 3EM
- Phase
- Single-phase or three-phase installations
- Installation
- DIN-rail / panel-mounted with external current transformers
- Measurement
- Three-phase CT energy meter with bidirectional import/export measurement
- Max current
- 120 A
Shelly Pro 3EM-3CT63
- Phase
- Single-phase or three-phase installations.
- Installation
- DIN-rail mounted panel energy meter with a combined 63 A three-phase current transformer.
- Measurement
- CT-based single- or three-phase energy meter with 4-quadrant / photovoltaic-ready active-energy measurement.
- Max current
- 63 A
Shelly Pro 3EM-400
- Phase
- Three-phase or single-phase installations; supports multiple connection types and phase-sequence detection.
- Installation
- DIN-rail mounted electrical-panel energy meter using external current transformers; intended for qualified installation.
- Measurement
- CT-based three-phase / multi-circuit energy meter measuring voltage, current, active/apparent power, accumulated energy, and 4-quadrant import/export energy.
- Max current
- 400 A
SMA Energy Meter
- Phase
- US split-phase; 208 V with added third CT; not 3-phase 480 V.
- Installation
- Main service-panel retrofit meter with mounting adapter; Ethernet to LAN/router/inverter, optional RS485 backup link.
- Measurement
- CT-based home-consumption and energy-management meter for SMA self-consumption, battery, peak-shaving and zero-export use cases.
- Max current
- 200 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 or three-phase installations | Single-phase or three-phase installations. | Three-phase or single-phase installations; supports multiple connection types and phase-sequence detection. | US split-phase; 208 V with added third CT; not 3-phase 480 V. |
| Installation | DIN-rail / panel-mounted with external current transformers | DIN-rail mounted panel energy meter with a combined 63 A three-phase current transformer. | DIN-rail mounted electrical-panel energy meter using external current transformers; intended for qualified installation. | Main service-panel retrofit meter with mounting adapter; Ethernet to LAN/router/inverter, optional RS485 backup link. |
| Measurement | Three-phase CT energy meter with bidirectional import/export measurement | CT-based single- or three-phase energy meter with 4-quadrant / photovoltaic-ready active-energy measurement. | CT-based three-phase / multi-circuit energy meter measuring voltage, current, active/apparent power, accumulated energy, and 4-quadrant import/export energy. | CT-based home-consumption and energy-management meter for SMA self-consumption, battery, peak-shaving and zero-export use cases. |
| Max current | 120 A | 63 A | 400 A | 200 A |
| Meter fit | ||||
| Accuracy class | Class B (active energy) | Class B active energy; Shelly documents 1% measurement accuracy. | Class B active energy; 1 percent measurement accuracy. | US meter accuracy: current 1.5%, voltage 0.5%, total active energy 2.0%. |
| Current sensing | 3 x 120A CTs included | Combined 63 A three-phase non-contact CT assembly supplied with the Pro 3EM-3CT63. | Includes 3 x 400 A current transformers for phase measurement; fourth CT input supports neutral-current measurement. | US kit includes 2 x 200 A clamp-on CTs; 208 V service requires adding a third CT and an additional conductor per SMA guidance. |
| Monitoring | ||||
| Protocol | Wi-Fi / Ethernet / Bluetooth / HTTP RPC / WebSocket / MQTT / Modbus | LAN / Wi-Fi / Bluetooth / Modbus / MQTT / HTTP / WebSocket | Ethernet / Wi-Fi / Bluetooth / MQTT / HTTP / WebSocket / RPC / Modbus | Ethernet / RS485 / SMA Speedwire / Modbus RTU |
| Local API | Yes | Yes | Yes | Yes |
| Cloud dependency | Optional cloud; local LAN/Wi-Fi use is supported through web UI, MQTT, HTTP/RPC, WebSocket, Modbus, scripting, and JSON/CSV export. | Optional Shelly Cloud for remote access; local LAN/Wi-Fi use is supported with embedded web interface plus Modbus, MQTT, HTTP, and WebSocket paths. | Optional Shelly Cloud; local LAN/Wi-Fi operation is supported through web UI, MQTT, HTTP/RPC, WebSocket, and Modbus-style paths. | Local Ethernet / RS485 data path to the SMA system; SMA Energy App and Sunny Portal are used for app/cloud monitoring. |
| Home Assistant | Yes | Yes | Yes | No |
| Solar fit | ||||
| Solar import/export | Yes | Yes | Yes | Yes |
| Buying context | ||||
| Price range | Unknown | About USD 150.99 | About USD 329.99 | Unknown |
| Availability | USA / EU | United States via Shelly USA official store; broader Shelly regional availability varies by country and distributor. | United States via Shelly USA store; broader Shelly regional availability varies by local store, distributor, and electrical compliance. | USA / Canada for the EMETER-US-50 SMA Energy Meter-US variant through SMA America and authorized distributors. |
| Source check | ||||
| Last verified | Jun 11, 2026 | Jun 16, 2026 | Jun 13, 2026 | Jun 7, 2026 |
| Product page | Official page | Official page | Official page | Official page |
| Documentation | Official docs | Official docs | Official docs | Official docs |
Verdict
Choose the Shelly Pro line for local protocols and CT flexibility, and SMA Energy Meter when inverter ecosystem fit matters more than general-purpose automation options.
FAQ
Common decision questions.
Which energy meter should I choose?
Choose the option that matches your installation constraints and data path first. For 4 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 Pro 3EM, Shelly Pro 3EM-3CT63, Shelly Pro 3EM-400 list Home Assistant support in the catalog. Shelly Pro 3EM, Shelly Pro 3EM-3CT63, Shelly Pro 3EM-400, SMA Energy Meter 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.
Does the verdict replace the specification table?
No. The verdict is a practical shortcut. Use the table to confirm the exact constraints that matter for your home, especially installation, monitoring, and support details.