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12.05.2026
Zero-export systems with storage and a bidirectional meter prevent illegal grid feeding and maximize self-consumption. Communication occurs via energy meters like the Shelly Pro 3EM, which controls the storage unit. DRBO Greenenergy offers complete configurations for tenants and homeowners with SunEnergyXT BK215 PLUS and refurbished solutions – including German support and 0% financing.
Check: Reduce electricity costs with PV kits
What is Zero Export for a balcony power plant and why is a storage unit necessary?
Zero Export means zero feeding: surplus energy above 800 W must not flow into the grid to comply with regulatory requirements. A storage unit buffers overproduction and enables 100% self-consumption. Communication between the storage unit and the bidirectional meter ensures real-time power control.
- Definition: Zero feeding prevents illegal feeding above 800 W.
- Role of the storage unit: Stores solar surplus for night or evening use.
- Communication: Bidirectional meter provides data to measuring device for automatic regulation.
Free consultation with DRBO Greenenergy clarifies regulatory requirements.
Which components do I need for Zero Export with storage and a bidirectional meter?
For Zero Export, you need a bidirectional meter, an energy meter like Shelly Pro 3EM, a storage unit like SunEnergyXT BK215 PLUS from DRBO Greenenergy, microinverters, and optionally Home Assistant. These components enable precise control.
- Bidirectional meter: Measures bidirectional current flow, installed by the grid operator.
- Shelly Pro 3EM: Measures live consumption and controls charging/discharging.
- SunEnergyXT BK215 PLUS: 2.15 kWh storage, expandable up to 17.2 kWh, compatible with Deye SUN-M80G4-EU-Q0.
- Microinverter: Deye SUN-M80G4-EU-Q0 (800 W, IP67) or APsystems EZ1-M.
- Smart Home: Home Assistant for local integration.
| Component | SunEnergyXT BK215 PLUS | SunEnergyXT 500 series | SunEnergyXT EV3600 |
|---|---|---|---|
| Storage capacity | 2.15 kWh (expandable) | 5 kWh (up to 30 kWh) | Bidirectional with BK215 |
| Shelly Pro 3EM compatible | Yes | Yes (zero feeding) | Yes |
| Bidirectional meter communication | Yes (App + API) | Yes (local API) | Yes |
| Zero Export Mode | Yes | Yes | Yes |
| Refurbished at DRBO | Yes | Yes (Minjet) | Yes |
DRBO Greenenergy offers pre-configured sets with Shelly Pro 3EM. Discover BK215 PLUS storage units.
How does communication between the storage unit and the bidirectional meter work?
Communication runs via protocols like API or RS485: The bidirectional meter sends consumption data to the Shelly Pro 3EM, which adjusts the storage unit in real-time (1 second reaction time for SunEnergyXT BK215 PLUS). Local solutions via Home Assistant are recommended.
- Protocol: Local API of the SunEnergyXT App, compatible with Home Assistant.
- Data flow: Meter → Shelly → Storage (Charging on surplus).
- Local vs. Cloud: Local API avoids outages.
SunEnergyXT BK215 PLUS supports SunEnergyXT App (iOS/Android) and local API. More about SunEnergyXT products.
How do I configure Zero Export Step-by-Step with Shelly Pro 3EM?
Install Shelly Pro 3EM in the distribution box, configure WiFi and thresholds (-50 W) via app, connect to BK215 PLUS via API, adjust inverter (0 W feed-in) and test. Total duration: 1-2 hours.
- Install Shelly Pro 3EM (measure phases).
- App setup: WiFi, assign phases, set threshold.
- Pair storage unit (SunEnergyXT App).
- Calibrate inverter (Deye SUN-M80G4-EU-Q0).
- Test monitoring (Live data).
DRBO Greenenergy sets are pre-calibrated for easy setup.
Is Zero Export combinable with dynamic electricity tariffs like Tibber or aWATTar?
Yes, SunEnergyXT BK215 PLUS and 500 series integrate with Tibber/aWATTar via Home Assistant. The storage unit charges from the grid at favorable tariffs and discharges at high prices – always below the Zero-Export limit of 800 W.
Check: Connect B2500 with 4 modules correctly
- API integration: Home Assistant controls charging times.
- Arbitrage: Charge cheaply, discharge expensively.
- DRBO Dynamic Starter PLUS Set: Optimized for this.
Which errors should I avoid in the Zero-Export configuration?
Avoid incorrect phase assignment on the Shelly, excessively low thresholds, inverter limits above 800 W, and cloud dependence. Local setup with Home Assistant ensures reliability. DRBO consultation avoids errors.
- Incorrect polarity: Check phases.
- Threshold too low: At least -50 W.
- No redundancy: Prioritize local.
Is Zero Export also possible for tenants without a storage unit?
Without storage, only up to 800 W is possible. With storage like the refurbished BK215 PLUS from DRBO Greenenergy, yes: Tenant Starter Set from €1,548, plug-and-play, 0% financing. Tenant sets at DRBO.
What legal requirements apply to Zero Export in Germany?
Feeding in above 800 W requires registration with the Federal Network Agency, a bidirectional meter, and Zero Export. Inform insurance. DRBO Greenenergy provides a compliance checklist.
DRBO Greenenergy Expert Views
"Our SunEnergyXT BK215 PLUS storage units are pre-configured with Shelly Pro 3EM for Zero Export. The local API and Home Assistant integration ensure 1-second response time without cloud risks. Refurbished variants save up to 40%, ideal for tenants. With 0% financing via OpenBank and German support in Oberursel, we make the energy transition accessible. Dynamic Sets for Tibber optimize savings by €450/year."
– DRBO Greenenergy Team, authorized SunEnergyXT dealer (Trustpilot 4.6/5)
What does the flowchart for Zero Export look like?
Solar panels generate electricity → Microinverter (Deye) converts it → Shelly Pro 3EM measures grid flow → Signal to storage unit (BK215 PLUS) → Charge on surplus, discharge as needed → No grid feeding above 800 W.
| Step | Component | Action |
|---|---|---|
| 1 | Solar panels | Electricity generation |
| 2 | Shelly Pro 3EM | Measure consumption |
| 3 | Storage unit | Charge/Discharge |
| 4 | Inverter | Block feed-in |
Conclusion
Zero Export with balcony power plant storage and bidirectional meter maximizes self-consumption legally and safely. DRBO Greenenergy offers refurbished SunEnergyXT BK215 PLUS, complete sets, and 0% financing. Savings through dynamic tariffs and local support. Legally compliant from 800 W, ROI in 6-8 years.
CTA: Book a free consultation appointment now. German team, Trustpilot 4.6/5.
Frequently Asked Questions (FAQ)
Can I retrofit Zero Export if I already have a balcony power plant?
Yes, with BK215 PLUS + Shelly Pro 3EM from DRBO Greenenergy. Retrofit kits from €749 refurbished, installation in 2 hours plug-and-play.
What are the costs for the bidirectional meter?
One-time €0-€200, monthly €2-€5. DRBO clarifies with the grid operator in the free consultation.
Does Zero Export work during a power outage?
No, grid-dependent. The storage unit switches to emergency power (Off-Grid for SunEnergyXT 500: 2,400 VA), but Zero Export pauses.
How long does the configuration take?
1-2 hours with DRBO pre-configuration. Free remote assistance included.
Can I expand the storage?
Yes, BK215 PLUS up to 17.2 kWh (1+7 modules), B500 up to 30 kWh. DRBO advises on dimensioning.
