What Is a Solar Panel Efficiency Monitoring Device?
A solar panel efficiency monitoring device is a machine used to monitor the performance of solar panels in a photovoltaic system.
There are various types of products with different operating mechanisms, including devices that directly monitor solar panels, measurement instruments called CT sensors, and devices that directly obtain data from power conditioners. By using a solar panel efficiency monitoring device, it is possible to quickly respond to any issues in solar power generation, thereby enhancing generation efficiency.
Uses of Solar Panel Efficiency Monitoring Devices
The primary use of solar panel efficiency monitoring devices is to measure data such as power generation and provide information to determine whether the system is operating correctly. Some products, when used in combination with an internet connection, allow users to easily check the power generation status remotely from a computer or smartphone.
These functions enable effective maintenance and efficient operation of solar power generation facilities.
Principle of Solar Panel Efficiency Monitoring Devices
Overview
Solar panel efficiency monitoring devices mainly use systems that obtain data from power conditioners and systems that measure current values through wiring using measurement instruments like CT sensors.
Power Conditioner Monitoring Type
The power conditioner monitoring type of solar panel efficiency monitoring devices communicates with power conditioners equipped with communication functions via communication methods such as RS485 or TCP/IP to monitor the power generation status.
This allows for the acquisition of information such as the amount of power generated by each circuit (string) and the monitoring of power conditioner operation and faults. In the event of a power generation stoppage, it can also identify and predict the cause.
However, disadvantages include high installation costs, limited compatible power conditioners, and the inability to obtain data if the power conditioner’s communication infrastructure is faulty, even if power is being generated.
Current Measurement Type (CT Sensor Type)
Solar panel efficiency monitoring devices that use measurement instruments like CT sensors monitor by attaching the instruments to the wires that transmit power to the electrical grid, measuring voltage, current values, and power generation. CT in CT sensors stands for Current Transformer. Since it is attached directly to the wiring, it can be installed regardless of the type of power conditioner and can monitor each panel by installing it on each one. Another characteristic is that it is relatively cheaper to install compared to the power conditioner monitoring type.
Disadvantages include difficulties in pinpointing the cause of power generation decreases due to only measuring AC current values, making it hard to determine if the issue is due to abnormalities or weather conditions, and measurement errors compared to the actual power generation since current values are measured from the wiring.
Types of Solar Panel Efficiency Monitoring Devices
Various manufacturers offer a wide range of solar panel efficiency monitoring devices. Depending on the application, products are available for large-scale commercial use, such as power plants, as well as for residential use.
Some products feature unique functions, such as detecting user-defined percentage deviations from the average values within multiple strings and comparing power among strings, allowing for panel-based monitoring. This makes it possible to specifically detect and report individual panel faults. Other examples include:
- Residential products with easy-to-read measurement display panels
- Products that display self-sufficiency rates and CO2 reduction amounts in conjunction with home power consumption measurement
- Products designed for large-scale monitoring with excellent multi-site monitoring and cloud integration
- Products that are highly compatible with multiple devices such as PCs, smartphones, and tablets
Selecting the appropriate product based on the application is essential.