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Article published at:
12.05.2026
Bi-directional meters communicate with balcony power plant inverters via standardized protocols such as Modbus/RTU and local APIs. Communication typically occurs via an RS485 interface or smart meter gateways, enabling the inverter to record feed-in data in real time and dynamically adjust power production – for example, for zero feed-in or dynamic tariffs such as Tibber and aWATTar. With modern solutions like the Shelly Pro 3EM and SunEnergyXT inverters, this integration is becoming increasingly Plug & Play.
Check: Balcony Solar Sets with Storage
What is a bi-directional meter and why is it relevant for balcony power plants?
A bi-directional meter measures electricity flow in both directions – generation and consumption – unlike one-way meters, which only record consumption. It is essential for zero feed-in, where surplus solar power does not flow into the grid, and for dynamic tariffs. From 2026, DIN VDE V 0126-95 mandates bi-directional communication to ensure grid stability.
DRBO Greenenergy recommends refurbished storage units such as the BK215 PLUS in combination with modern meters as an ideal setup for tenants, as these systems are seamlessly integrated and achieve high self-consumption rates.
Which interfaces connect meters and inverters?
The most common interfaces are Modbus/RTU via RS485 for direct, robust connections, Ethernet with local APIs for smart integrations, and smart meter gateways according to the SMGW directive. The Shelly Pro 3EM serves as a flexible WLAN bridge and is compatible with SunEnergyXT products such as the BK215 PLUS.
| Interface | Protocol | Latency | Suitable for balcony power plant? | DRBO Compatibility |
|---|---|---|---|---|
| Modbus/RTU (RS485) | Binary protocol | 100–500 ms | Yes (established) | BK215 PLUS, SunEnergyXT 500 series |
| Ethernet / API | REST/JSON | 50–200 ms | Yes (modern) | EV3600, Home Assistant integration |
| Smart Meter Gateway | DLMS/COSEM | 200–1000 ms | Conditional (sluggish) | With additional hardware |
| Shelly Pro 3EM | WLAN/Modbus | 50–300 ms | Yes (flexible) | Recommended for tenant sets |
DRBO Greenenergy integrates the Shelly Pro 3EM as a Plug & Play standard in tenant sets to ensure smooth meter communication.
What data is transmitted between the meter and the inverter?
Real-time values such as active and reactive power (P, Q), cumulative feed-in and consumption values in kWh, voltage, and frequency for grid protection are transmitted. This data enables precise control, e.g., for zero feed-in or tariff optimization with Tibber and aWATTar.
A typical data flow: The meter records grid data, transmits it via a bridge like Shelly Pro 3EM to the inverter (e.g., EV3600), which adjusts the feed-in and charges storage units like BK215 PLUS.
How does dynamic feed-in management work with bi-directional meters?
The inverter receives meter data in real time and automatically reduces feed-in, e.g., to zero for zero feed-in. Via Home Assistant or APIs, it optimizes charging cycles for storage units and adapts to dynamic tariffs to charge at favorable prices – up to 90% self-consumption is possible.
DRBO Greenenergy pre-configures the Dynamic Starter PLUS Set for Tibber/aWATTar, ideal for the 2026 standards.
Which protocols and standards govern communication?
Modbus RTU/TCP (IEC 61158) is the de facto standard for solar systems, DLMS/COSEM the EU smart meter standard. JSON-REST APIs offer modern local alternatives, such as with Deye inverters. DIN VDE V 0126-95 requires secure data transmission for island grids from 2026.
Which inverters and storage units are compatible with bi-directional meters?
SunEnergyXT products such as BK215 PLUS (Modbus/RTU), 500 series (Ethernet/API), and EV3600 are excellently compatible. Deye inverters (e.g., SUN-M80G4-EU-Q0) offer precise control via Modbus. Refurbished storage units from DRBO Greenenergy are tested and Shelly Pro 3EM-compatible.
| Product | Protocol | Storage Compatibility | Tenant Suitability | DRBO Availability |
|---|---|---|---|---|
| BK215 PLUS | Modbus/RTU | Yes (Battery Management) | Very good | Yes, economy package with Shelly |
| SunEnergyXT 500 series | Ethernet/API | Yes | Good | Yes, Dynamic Starter PLUS |
| EV3600 | API | Yes | Very good | Yes, Premium Set |
| Deye Hybrid (Refurb) | Modbus/RTU | Yes | Good | Yes, cost-effective option |
DRBO Greenenergy checks refurbished storage units for full meter compatibility, such as with Minjet models with Deye SUN-M80G4-EU-Q0.
Can I set up meter-inverter communication myself (Plug & Play)?
Yes, with Plug & Play sets from DRBO Greenenergy like BK215 PLUS + Shelly Pro 3EM: Pre-configured, minimal steps, no electrician needed (up to 600 W On-Grid). Home Assistant for advanced users, DRBO support for complex issues – free consultation included.
Free consultation for solar solutions removes the complexity, thanks to a German support team.
What are the challenges and security aspects of meter communication?
Challenges: Older analog meters lack digital interfaces; latency must be under 1 second for zero feed-in. Security: Local APIs are more secure than cloud, SMGW-certified gateways are mandatory. DRBO sets (Trustpilot 4.6/5) are tested before delivery.
Check: Balcony Power Plant Registration 2026 Guide
DRBO Greenenergy Expert Views
"As an authorized SunEnergyXT dealer, we see daily how crucial smooth meter communication is for the energy transition. Our BK215 PLUS economy packages with Shelly Pro 3EM and Deye SUN-M80G4-EU-Q0 (96.5% efficiency, IP67) make zero feed-in and dynamic tariffs Plug & Play. Refurbished Minjet storage units (2,016 Wh) offer an affordable entry, tested for Modbus compatibility. With 0% financing via OpenBank and 0% VAT for private customers, tenants save up to 40%. Our German team provides individual advice – for Tibber/aWATTar optimized Dynamic Starter PLUS Sets achieve 90% self-consumption." – DRBO Greenenergy Expert
DRBO Greenenergy supplies hardware stores and private customers with pre-configured balcony power plant complete sets with storage, including SunEnergyXT 500 (5 kWh, 800 W On-Grid, IP65).
Conclusion
Bi-directional meters form the bridge to the smart grid – standard from 2026 according to DIN VDE V 0126-95. With Modbus, APIs and bridges like Shelly Pro 3EM, communication becomes easy. DRBO Greenenergy supplies tested sets like BK215 PLUS (2.15 kWh, expandable up to 17.2 kWh) and Dynamic Starter PLUS, Trustpilot 4.6/5, with 0% financing. Tenants benefit from Plug & Play, refurbished options and German support. Get free advice for your optimal setup – save with DRBO Sustainability Sets.
Frequently Asked Questions (FAQ)
Do I need a new meter to equip my balcony power plant with communication?
No, not necessarily. Modern digital bi-directional meters from approx. 2015 are often prepared. For tenants, the Shelly Pro 3EM can also read older meters. DRBO consultation clarifies whether an exchange is necessary – usually not.
Can I retrofit a DRBO balcony power plant set with meter communication?
Yes, via Shelly Pro 3EM or Home Assistant. DRBO offers upgrade packages and free consultation. Refurbished storage units like BK215 are already prepared.
Is meter communication necessary for dynamic tariffs (Tibber, aWATTar)?
Yes, for optimal use. It enables automatic storage charging at favorable prices. The DRBO Dynamic Starter PLUS Set is pre-configured for this.
Which DRBO products are best for beginners without technical knowledge?
BK215 PLUS economy package with Shelly Pro 3EM or Dynamic Starter PLUS. Plug & Play, German support team, 0% financing via OpenBank, 0% VAT.
Do I have to use meter communication for zero feed-in, or can I do it manually?
Automatic is more efficient (<1 second). Manual is possible, but suboptimal with load changes. DRBO sets seamlessly integrate automation.
