Testing & Measurement
I-V Curve Measurement & Reporting
On-site measurement and reporting of real panel string performance under IEC 60891.
With I-V Curve measurement, we extract current-voltage measurements of all solar panel strings on site and inspect for problems such as LID, PID, micro-cracks and degradation. These measurements also serve as a logbook, helping you see how much panels have degraded over time. This test answers the panel-related part of the question 'Why is my plant underproducing?'
Why Is It Needed?
What Can You Learn?
Real Power Performance
Learn the real power of your panels and check consistency with factory data.
LID Losses
Detect light-induced degradation (LID) losses in your panels.
PID Losses
Identify potential-induced degradation (PID) losses.
DC Cable Issues
Detect ground contact or leakage from cable cuts, rodent damage and other causes.
Bypass Diode Problems
Identify any problems with bypass diodes on your panels.
Shading
Detect shading-related problems.
Faulty Connections
Identify possible faulty connections in panel strings.
Scope
Why Is the I-V Curve Important?
Panel Efficiency
Checks whether panels operate according to manufacturer specifications.
Potential Faults
Detects performance losses from shading, soiling and temperature effects.
Production Capacity
Checks whether the inverter's MPP tracking algorithm works correctly.
Maintenance Planning
Provides key data to determine maintenance timing.
Technical Process
How Is I-V Curve Measured?
- 01
Connection
The device is connected to the solar panel and inverter.
- 02
Measurement
The device measures current and voltage at different operating points to form the I-V curve.
- 03
Analysis
The generated graph is analyzed in detail by an expert team.
- 04
Reporting
Analysis results are presented in a detailed report.
Methods & Outputs
Performance Simulation (PVSYST)
Real-Data Simulation
Simulation using recorded irradiance, panel temperature and manufacturer PAN files.
Production Comparison
Expected vs. actual production compared; losses examined.
Performance Value
Plant performance value determined and a production profile generated.
FAQ
Frequently Asked Questions
It is a measurement that analyzes the electrical performance of solar panels in detail, revealing system health and efficiency.
Generally once or twice a year is recommended; more frequent measurement may be done when performance decline is observed.
Panel efficiency, shading, soiling, temperature effects and inverter MPP tracking accuracy, among many parameters.
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