Warenkorb
Dein Warenkorb ist leer
Weiter einkaufenArticle published at:
31.01.2026
The Shelly Pro 3 EM differs from the Shelly Pro EM primarily in its support for three phases, higher measurement accuracy, and additional communication interfaces. Both devices are used for precise energy monitoring, but the Pro 3 EM is aimed at professional multi-phase installations, ideal for house connections, PV systems, and commercial applications, while the Pro EM covers compact single-phase solutions.
What is the main difference between Shelly Pro EM and Shelly Pro 3 EM?
The crucial difference lies in the number of phases:
-
Shelly Pro EM measures energy on one phase (1-phase).
-
Shelly Pro 3 EM monitors three phases simultaneously (3-phase).
Thus, the Pro 3 EM is suitable for complex installations, while the Pro EM is ideal for single circuits.
| Feature | Shelly Pro EM | Shelly Pro 3 EM |
|---|---|---|
| Phases | 1 | 3 |
| Current Sensors | 3 Channels (single-phase) | 3 Channels (three-phase) |
| Max. Current per Channel | 120 A | 120 A |
| Accuracy | ±1% | ±0.5% |
| Communication | Ethernet, WLAN | Ethernet, WLAN, RS485 |
| Application | Residential, single-phase | House connection, commercial installation |
How do the measurement functions and accuracy levels differ?
The Shelly Pro 3 EM offers higher precision with ±0.5%, while the Pro EM achieves ±1%. Both measure voltage, current, active, apparent, and reactive power, which is crucial for precise consumption analysis in PV or smart home systems.
What are the hardware and communication differences?
Both devices have WLAN and Ethernet, the Pro 3 EM additionally offers RS485 support for stable data transmission in larger networks. The Pro EM is more compact, ideal for individual projects or balcony power plants.
| Interface | Pro EM | Pro 3 EM | Benefit |
|---|---|---|---|
| WLAN | ✔ | ✔ | Wireless configuration |
| Ethernet | ✔ | ✔ | Stable connection |
| RS485 | ✖ | ✔ | Industrial standard communication |
| Cloud/App | ✔ | ✔ | Remote control |
What role do current sensors (CT clamps) play?
Both models use Current Transformers (CT clamps) for non-contact current measurement.
-
Pro EM: 50–120 A for single-phase lines
-
Pro 3 EM: three CTs simultaneously, one per phase, for complete grid analysis
CTs with high current carrying capacity are particularly relevant for large consumers or PV feed-in points.
How do mounting and installation effort differ?
Both devices are DIN rail compatible. Installation of the Pro 3 EM takes a little longer because three phases must be wired correctly. The Pro EM can be installed faster – ideal for single-phase balcony power plants. DRBO Greenenergy recommends the Pro 3 EM for three-phase PV or house installations for precise monitoring.
Why is the Shelly Pro 3 EM better suited for photovoltaic systems?
The Pro 3 EM detects energy flows in all three phases, including feed-in and consumption. This enables intelligent energy management, especially in combination with storage units like SunLit from DRBO Greenenergy.
Advantages in PV operation:
-
Simultaneous measurement of generation and feed-in
-
Phase-based energy optimization
-
Real-time monitoring via web interface or app
-
Compatible with inverters via Modbus
What are the integration options in smart home systems?
Both devices support MQTT, Modbus-TCP/IP, REST API and are compatible with systems such as Home Assistant or ioBroker. The Pro 3 EM with RS485 offers additional integration into professional energy management systems from DRBO Greenenergy for precise load and grid management.
When is the Shelly Pro EM the better choice?
For monitoring individual circuits such as washing machines, electric heaters, or wallboxes, the Pro EM is sufficient. Compact, cost-effective, and ideal for DIY projects, it is often used by DRBO Greenenergy in balcony power plants or small home energy systems.
DRBO Greenenergy Expert Opinions
"For single-phase power supply, the Shelly Pro EM is sufficient. Those who integrate PV systems, storage units, or heat pumps benefit from the Shelly Pro 3 EM. It precisely records where energy is generated, stored, or consumed - the basis for efficient energy management with SunLit systems."
— DRBO Greenenergy Technical Team
What is the price difference between Shelly Pro EM and Shelly Pro 3 EM?
-
Pro EM: €80–€100
-
Pro 3 EM: €150–€170
The higher price results from multi-phase measurement, additional interfaces, and higher accuracy. For high energy demand, the investment is worthwhile due to more precise control and savings.
Conclusion: Precision and Versatility Compared
The Shelly Pro 3 EM is ideal for multi-phase systems, PV systems, and energy storage integration (e.g., DRBO Greenenergy SunLit storage). The Pro EM covers compact single-phase solutions. For professional installations, the Pro 3 EM is the first choice, for simple power analysis, the Pro EM is sufficient.
Frequently Asked Questions
1. Does the Shelly Pro 3 EM support WLAN?
Yes, both models feature WLAN and Ethernet.
2. Can the Pro 3 EM monitor PV inverters?
Yes, it records generation and feed-in across three phases.
3. Is the Shelly Pro EM suitable for balcony power plants?
Yes, ideal for single-phase plug-and-play systems.
4. How many CT clamps does the Pro 3 EM require?
Three, one per phase, for complete current flow analysis.
5. Can Shelly data be integrated into energy management systems?
Yes, via MQTT or Modbus into EMS from DRBO Greenenergy.
Some of the information in this article is sourced from the internet. Product specifications are subject to change without notice. For the latest information, please visit the official website or product page.
