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In an integrated photovoltaic (PV) and energy storage system, precise, real-time metering across power generation, energy storage, consumption, and grid-connection stages is the primary prerequisite for maximizing on-site consumption, optimizing economic efficiency, and ensuring stable operation. Smart meters and their derived metering solutions serve as the data foundation for building such a transparent and optimizable energy flow.
1. Multi-node Precision Metering: Building Full-link Data Transparency
An efficient PV-storage system relies on data from multiple critical metering points:
PV Power Generation MeteringA DC meter installed on the DC side of the inverter directly measures the original power output of the PV array, enabling accurate evaluation of PV system efficiency and distinguishing losses from modules, cables, and inverter conversion.
Energy Storage System MeteringA high-precision bi-directional DC meter installed between the battery and converter independently and accurately measures battery charge/discharge energy, serving as the core basis for calculating round-trip efficiency, evaluating battery health status, and conducting internal accounting.
Grid-connection Point MeteringA bi-directional AC smart meter installed at the grid access point acts as the legal metering gateway for net energy settlement, subsidy collection, or surplus power trading with the utility grid. It precisely records power imported from the grid and fed back to the grid.
2. Providing Trusted Data Sources for Energy Management Systems
Real-time data (power, energy, voltage, current) from the above metering points is uploaded to residential or industrial and commercial energy management systems (EMS) via standard communication interfaces (e.g., RS-485, Modbus, DLMS). Meter data serves as the fundamental input for EMS optimization:
Operational Strategy OptimizationBased on real-time electricity prices, PV generation forecasts, and load forecasts, the EMS develops optimal battery charge/discharge schedules to maximize self-consumption rates or economic benefits.
System Performance MonitoringBy comparing PV DC generation, storage charge/discharge energy, and grid exchange energy, the overall efficiency of the PV-storage system is continuously evaluated to identify performance bottlenecks.
Safety Status MonitoringElectrical parameters from meters provide critical references for monitoring normal system operation and detecting anomalies such as islanding and overvoltage.
3. Supporting Grid Interaction and Advanced Applications
For grid operators, user-side smart meters (especially grid-connection meters) act as "eyes" to perceive the status of distributed energy resources:
Visibility and ControllabilityAggregated data from massive meters enables the grid to grasp the total output and load profiles of distributed PV and energy storage systems.
Interaction EnablementWhen conditions allow, the grid can incentivize PV-storage systems to participate in demand response or provide ancillary services through price signals or direct commands coordinated via EMS, enhancing grid flexibility.
Conclusion: From Metering to Empowerment
In PV energy storage systems, the value chain of smart meters has extended from single settlement metering to underlying data empowerment for system performance evaluation, EMS optimization algorithm support, and grid-side distributed resource management.
For system integrators, selecting meters with high metering accuracy, reliable communication, and open data access is critical to ensuring project performance verifiability, revenue measurability, and system scalability. This concerns not only compliance but also the full lifecycle data value and operational potential of the delivered assets. Our dedicated metering solutions for PV-storage scenarios are designed to convert every unit of green energy generation, storage, and consumption into clear, credible, and actionable data.
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