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14.05.2026
The Marstek Smart Meter (CT-Clamp) can be installed on the main conductor in a few minutes, measures consumption and feed-in bidirectionally, and enables zero-export control for balcony power plants. This way, you reduce grid feedback and increase self-consumption – ideal in combination with storage solutions.
Why do you need a smart meter for PV?
More and more households are operating balcony power plants, but many operate without intelligent metering. A CT-clamp meter is cost-effective, quick to install, and provides the real-time data a storage unit needs for zero-export.
What are the weaknesses of traditional measurement methods?
Conventional meters are usually only intended for billing, provide data only roughly or monthly, and offer no real-time control. CT-clamp systems, on the other hand, measure bidirectionally in real time and can be connected directly to inverters and storage units.
What does the Marstek Smart Meter offer?
The Marstek Smart Meter works with a CT clamp (100 A), measures consumption and feed-in bidirectionally, supports WLAN (2.4G) and Bluetooth, offers a zero-export mode, and provides real-time data in the app. Automatic calibration and phase detection facilitate use; the housing is IP65-protected.
Marstek Smart Meter in comparison
| Criterion | Traditional meters | Marstek CT-Clamp |
|---|---|---|
| Installation time | 60 min. + electrician | a few minutes DIY |
| Accuracy | rough | high (approx. ±1%) |
| Data availability | monthly | real-time |
| Zero-export control | mostly not possible | integrated |
How to connect the Marstek Smart Meter step by step?
- Turn off power: Remove fuse in the meter box (main conductor).
- Identify conductor: Find L1 phase at the main connection.
- Mount CT-Clamp: Arrow direction towards the load, close clamp around the phase conductor (not the neutral conductor).
- Connect cable: Connect measuring cable to the storage unit or the CT port.
- Commissioning: Turn on power, pair app, start calibration.
Important: Only carry out work in the meter box if you feel confident – if in doubt, consult a specialist.
Who benefits – typical scenarios
Tenants with 800 W balcony power plant: Zero-export mode avoids feedback and maximizes self-consumption.
Family with storage: Load control and real-time data increase self-consumption.
Two-family house: automatic phase detection ensures correct measured values.
Our recommendation
Achieve grid zero independently of manufacturer
For precise zero-export – regardless of the storage ecosystem – the Shelly Pro 3EM is the proven choice (3-phase measurement, this exact meter was also used in the BILD practical test). For contactless surplus detection via infrared, there is also the EcoTracker IR.
→ Using PV surplus: Smart Plug vs. Shelly Pro 3EM · Best Balcony Storage 2026
View Shelly Pro 3EM →Immediately available · compatible with SunEnergyXT BK215 & 500.
Frequently Asked Questions (FAQ)
Where do you clamp the CT-Clamp?
Around the L1 main conductor in the meter box or at the distributor, arrow direction towards the load.
Does it work in a three-phase system?
Yes, the phase is automatically detected; for complete 3-phase measurement, a 3-phase meter like the Shelly Pro 3EM is suitable.
Do I need an electrician?
Not necessarily if you are confident handling the meter box; if unsure, consult a specialist.
Which app is needed?
The manufacturer's app, connected via 2.4 GHz WLAN, provides real-time data and configuration.
Conclusion
A Smart Meter (CT-Clamp) is the basis for zero-export and optimizing self-consumption. With quick installation, real-time measurement, and zero-export control, you get more out of your balcony power plant – especially in combination with a storage unit. If you want to remain manufacturer-independent, the Shelly Pro 3EM is the best choice.
As of: 2026. Information subject to change. Brand and product names belong to their respective manufacturers.
