As “solar + storage” solutions rapidly gain traction in both residential and commercial settings worldwide, the need for intelligent and precise system management becomes increasingly important.
The Role of Current Transformer in a Solar-Storage System
In solar-plus-storage systems, CTs are key sensors used to monitor current magnitude and direction. They are essential for tracking energy flows and understanding user behavior. Their main functions include:
- Accurate Measurement & Data Collection
CTs collect current and power data across different nodes, serving as a critical input for system control and decision-making.
- Grid Compliance & Coordination
By monitoring grid-connected parameters, CTs ensure the system complies with utility standards and provide feedback to grid dispatchers for stability.
- System Diagnostics & Maintenance
Changes in current patterns help identify potential faults in PV arrays or battery systems, enabling precise troubleshooting and efficient maintenance.
Traditionally, solar-plus-storage systems use a single CT at the main incoming power line to monitor energy exchange between the grid and the home—primarily to detect whether the household is drawing power from the grid or exporting excess energy. In some countries/regions where grid export is restricted or prohibited, EMS (energy management systems) use CT data to adjust or limit output accordingly.
Why Dual CT Technology?
Modern solar-storage systems aim for more than just self-consumption—they are designed to maximize self-use, reduce electricity bills, and participate in Virtual Power Plant (VPP).
The Hinen A Series AC5S 5kW AC-coupled all-in-one RESS features the Dual CT Technology with CTs installed at:
- Grid connection point (Grid CT): To monitor power import/export with the grid
- PV inverter connection point (PV CT): To measure solar power generation
This setup delivers a more comprehensive data profile, allowing the system to accurately track energy direction and magnitude in real time, which is essential for intelligent battery dispatch and energy flow control.
Key Advantages of Hinen's Dual CT Technology
1. Precise Energy Flow Detection
Single-CT systems struggle to identify whether household loads are powered by solar, battery, or the grid—leading to potential misjudgments. For instance, if outbound current is detected, the system may not know whether it's due to decreased household demand or a fully charged battery.
The dual-CT setup enables users to obtain real-time generation data from third-party PV inverters, helping the system accurately calculate power output.
2. VPP-Ready Architecture
In a Virtual Power Plant (VPP) setup, home battery systems become grid assets, dynamically importing or exporting power based on utility signals.
The dual CT system offers high-resolution data interfaces, meeting the stringent requirements of VPP integration and remote dispatching.
3. Clip-On Design for Easy Installation
Unlike traditional CTs with complicated wiring, Hinen’s CTs feature a clip-on structure that significantly simplifies installation and improves efficiency.
Conclusion
As the energy sector evolves toward a distributed and intelligent grid, granular energy management becomes a critical foundation.
Hinen’s dual CT technology not only enhances the data awareness of PV + storage systems but also empowers homes to enter the future energy market seamlessly.
Hinen remains committed to innovation, helping more users transition toward a smart, low-carbon energy future.
For more technical details about Hinen’s energy storage systems, visit www.hinen.com or contact us at service@hinen.com.
