Learning Outcome1.1 Introduction1.2 Types of Faults and Its Classifications1.2.1 Open Circuit Faults1.2.2 Short-Circuit Faults1.2.3 Symmetrical Faults1.2.4 Unsymmetrical Faults1.3 Faults in PV Systems1.3.1 Hot Spots in PV Module1.3.2 Delamination of PV Module1.3.3 Discoloration of Encapsulation of PV Module1.3.4 Corrosion1.3.5 Micro Crack, Snail Trail, and Cell Damage1.3.6 Shading Fault1.4 Comparison of Faults1.5 Detection and Diagnosis of Faults in PV1.5.1 Voltage and Current Measurement1.5.2 IV Characteristics Analysis1.5.3 Fault Diagnosis Based on AI Method1.5.4 Statistical and Signal Processing–Based Approach1.5.5 Methods Based on Power Losses1.6 Classification of Fault States in Solar PV Systems1.6.1 Performance Index of Solar PV System1.6.1.1 Performance Ratio (PR)1.6.1.2 Weather-Corrected Performance Ratio (WCPR)1.6.1.3 Linear Regression (LR) and Weather-Corrected Linear Regression (WCLR)1.7 Assessment of Solar Power Plant Resources1.7.1 Clearness Index (CI)1.7.2 Proposed Variable Index (PVI)1.8 Technique for Detecting Outliers in Solar PV Power Plants1.8.1 Estimated Error Matrix (EEM)1.8.2 Estimated Square Error Index (ESEI)1.8.3 Support Vector Machine (SVM)1.8.4 Kernel Function1.9 ConclusionReferences