Smart Energy Optimization in Multi-Family Housing: Eniris Integrates with PPC Smart Meter Gateways

In this article, we dive into the technical realization: from the PPC module connection to the complex Metering Concept D5.

Metering Concept D5 (MK D5) Explained

A vital component of this project is Metering Concept D5. This setup is specifically designed for multi-unit buildings where "Collective Building Supply" (Gemeinschaftliche Gebäudeversorgung) is central.

How does MK D5 work?

In an MK D5 configuration, all energy flows within a building are mapped in detail through a cascade connection:

• Generation Meter (Erzeugungszähler): Measures the total output of the PV system (e.g., 16 kWp per building).
• General Meter (Allgemeinzähler): For the building’s common areas.
• Tenant Meters (Wohnungszähler): Individual meters for participating residents.
• The Battery: Strategically installed behind the generation meter to maximize local consumption.

The Eniris EMS uses the data from this cascade to determine exactly how much solar energy is available for residents at any given moment versus how much should be stored in the battery.

Intelligent Control: Beyond Simple Monitoring

The Eniris platform goes far beyond basic monitoring. For this project, we are implementing several crucial high-level functions:

1. Dynamic Participant Logic

A unique advantage of our system is its flexibility. If the resident structure changes (for example, if 6 out of 11 tenants participate), our EMS can be adjusted instantly via the API. No site visit is required to change the battery's control logic or the data basis for charging/discharging.

2. Algorithmic Optimization

• 60% Feed-in Limitation: We ensure the PV system complies with legal requirements (§9 EEG) by actively managing inverters (such as Huawei or Sungrow).
• Negative Pricing Avoidance: The EMS prevents feeding electricity back into the grid when energy market prices turn negative.
• Fallback Scenarios: In the event of an LTE connection loss with the PPC gateway, the system automatically switches to a local safety mode to maintain system stability and protect the battery.

3. Future-Proofing (§14a EnWG)

By integrating with the PPC module, the installation is ready for the future. Control signals from the Grid Operator (DSO) to limit power—to protect the local grid—can be directly translated by the Eniris EMS into actionable commands for the battery or EV charging infrastructure.