Raspberry Pi based photovoltaic I-V curve tracer
P Casado1, J M Blanes1, C Torres1
1Industrial Electronics Group, University Miguel Hernández of Elche, Spain.
Hardwarex
|May 5, 2022
Summary
A new photovoltaic current-voltage (I-V) tracer was developed using a Raspberry Pi for efficient testing of solar panels. This system verifies solar panel specifications and detects failures quickly.
Area of Science:
- Electrical Engineering
- Renewable Energy Systems
- Instrumentation and Measurement
Background:
- Photovoltaic (PV) systems require accurate performance monitoring.
- Existing methods for PV performance testing can be complex or costly.
- Rapid verification of PV installations is crucial for reliable energy generation.
Purpose of the Study:
- To design and implement a cost-effective and user-friendly photovoltaic current-voltage (I-V) tracer.
- To create a system capable of immediate verification of solar panel specifications.
- To enable prompt detection of potential failures in photovoltaic installations.
Main Methods:
- Development of an I-V tracer utilizing a capacitive load controlled by a Raspberry Pi 4B.
- Integration of safety protections, power electronics for capacitor management, and comprehensive sensor arrays (current, voltage, irradiance, temperature).
- Implementation of custom software with a graphical user interface (GUI) for system control and data visualization.
Main Results:
- The system successfully measures key photovoltaic parameters including maximum power point (MPP), open-circuit voltage (Voc), and short-circuit current (Isc).
- Accurate calculation and display of module efficiency are achieved.
- Results are presented on an integrated LCD touch display for ease of use.
Conclusions:
- The designed photovoltaic I-V tracer provides a valuable tool for on-site testing of solar installations.
- The system facilitates immediate performance verification against manufacturer specifications.
- It offers a practical solution for identifying and diagnosing potential issues in photovoltaic panels.
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