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-3CT63
Best fit when single-phase or three-phase installations; 100-260 V AC, 50/60 Hz supply and voltage inputs., solar import/export visibility, and local dashboards and Home Assistant.
Shelly Pro 3EM-400
Best fit when single-phase or three-phase four-wire monitoring; 110-240 V AC supply, 100-260 V RMS per-phase measurement, 50/60 Hz., solar import/export visibility, and local dashboards and Home Assistant.
SMA Energy Meter
Best fit when 120/240 V split-phase; 208 V 3-phase with a third CT and L3 voltage conductor; 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-3CT63
- Phase
- Single-phase or three-phase installations; 100-260 V AC, 50/60 Hz supply and voltage inputs.
- Installation
- DIN-rail panel installation with the included 3CT63 combined non-contact CT; professional electrical installation is recommended.
- Measurement
- CT-based single- or three-phase four-quadrant metering of import/export active energy, apparent energy, voltage, current, power and power factor.
- Max current
- 63 A
Shelly Pro 3EM-400
- Phase
- Single-phase or three-phase four-wire monitoring; 110-240 V AC supply, 100-260 V RMS per-phase measurement, 50/60 Hz.
- 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
- 120/240 V split-phase; 208 V 3-phase with a third CT and L3 voltage conductor; not 3-phase 480 V.
- Installation
- Main-service-panel retrofit downstream of utility meter; included magnetic/duct-tape mounting adapter and clamp CTs; qualified-person installation.
- Measurement
- CT-based current, voltage, power factor, frequency, and active/reactive/apparent power and energy; import/export monitoring; not utility billing.
- 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; 100-260 V AC, 50/60 Hz supply and voltage inputs. | Single-phase or three-phase four-wire monitoring; 110-240 V AC supply, 100-260 V RMS per-phase measurement, 50/60 Hz. | 120/240 V split-phase; 208 V 3-phase with a third CT and L3 voltage conductor; not 3-phase 480 V. |
| Installation | DIN-rail panel installation with the included 3CT63 combined non-contact CT; professional electrical installation is recommended. | DIN-rail mounted electrical-panel energy meter using external current transformers; intended for qualified installation. | Main-service-panel retrofit downstream of utility meter; included magnetic/duct-tape mounting adapter and clamp CTs; qualified-person installation. |
| Measurement | CT-based single- or three-phase four-quadrant metering of import/export active energy, apparent energy, voltage, current, power and power factor. | CT-based three-phase / multi-circuit energy meter measuring voltage, current, active/apparent power, accumulated energy, and 4-quadrant import/export energy. | CT-based current, voltage, power factor, frequency, and active/reactive/apparent power and energy; import/export monitoring; not utility billing. |
| Max current | 63 A | 400 A | 200 A |
| Meter fit | |||
| Accuracy class | Class B active energy; +/-1% current accuracy from 2-63 A. | Class B active energy; 1% design-validated measurement accuracy. | Full-scale accuracy: current 1.5%; voltage 0.5%; active energy 2.0%. |
| Current sensing | Included combined 3CT63 non-contact three-phase CT assembly, rated 0-63 A with a 9 mm conductor aperture. | Three included CT-400A transformers cover phases A/B/C up to 400 A; a fourth CT input can measure neutral current, but the neutral CT is optional and not included. | Two 200 A clamp-on CCT1U CTs are included for 120/240 V split-phase service; supported 208 V three-phase service requires an additional third CT and L3 voltage conductor. |
| Monitoring | |||
| Protocol | Ethernet / Wi-Fi / Bluetooth / Modbus TCP / MQTT / RPC / HTTP / WebSocket / KNXnet/IP | Ethernet / Wi-Fi / Bluetooth / MQTT / HTTP / WebSocket / RPC / Modbus | 10/100 Ethernet: SMA Energy Meter Protocol / Speedwire and Modbus TCP; RS-485: Modbus RTU |
| Local API | Yes | Yes | Yes |
| Cloud dependency | Shelly Cloud is optional; local LAN/Wi-Fi, web UI, RPC, Modbus, MQTT, HTTP, WebSocket and Home Assistant operation do not require cloud. | Shelly Cloud optional; standalone LAN/Wi-Fi, local APIs, and Home Assistant work without cloud. | Local LAN or RS-485 operation does not require cloud. Remote app monitoring uses SMA Energy App and Sunny Portal/ennexOS. |
| Home Assistant | Yes | Yes | No |
| Solar fit | |||
| Solar import/export | Yes | Yes | Yes |
| Buying context | |||
| Price range | About USD 150.99 | About USD 329.99 | Unknown |
| Availability | United States and European Union through official Shelly stores; other regional and distributor availability varies. The official Asia storefront showed unavailable on 2026-09-27. | United States and Europe through official Shelly stores; availability, price, tax, delivery and electrical compliance vary by country. | United States and Canada only for the EMETER-US-50 / ES103 LR CCT1U variant; purchase is through SMA authorized distributors. |
| Source check | |||
| Last verified | Sep 27, 2026 | Sep 23, 2026 | Sep 19, 2026 |
| Product page | Official page | Official page | Official page |
| Documentation | 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 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 Pro 3EM-3CT63, Shelly Pro 3EM-400 list Home Assistant support in the catalog. 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.