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Abstract
The rising desire to get long-term power has stepped up the utilisation of solar photovoltaic (PV) systems all over the world. Nonetheless, keeping the solar panels in optimal performance is a major concern because of the changeable environmental conditions, wear and tear of the equipment and breakdown of operations. Deep learning (DL) has become an efficient solution of offering sophistication in predicting solar power generation, fault detection, and optimization of the performance. The review will go in depth over several DL methodologies, such as, CNN, LSTM, Transformer-based models, Reinforcement Learning, GANs, and hybrid architectures of CNN-LSTM. The implementation of each model, performance metrics of MAE, RMSE, R2, and MAPE as well as weak points and advantages of each model, are provided in their relation to increasing PV efficiency. Moreover, the paper covers real-life data, real-life implementations, and comparative performance of these models in addressing critical issues in the solar energy systems.
Nonetheless, despite the significant progress, there are still a number of challenges that need to be addressed, among which are the data sparsity, inability to generalize the models to different areas of interest, computational limitations, and inability to interpret the models. To resolve these problems, future directions outlined by the present paper include the creation of lightweight models of edge-AI, the use of transfer learning to achieve regional adaptability, the possibility of Explainable AI (XAI), and the combination of deep learning and IoT and digital twin technology. I would say that the given comprehensive review is an excellent source of information that can be used by researchers, engineers, and policymakers who want to use deep learning to make solar panels as efficient as possible to deliver more resilient, reliable, and sustainable energy delivery.
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Copyright (c) 2025 Amjed Abbas Ahmed, Haneen Siraj Ibrahim, Ihtiram Raza Khan, Rabiu Aliyu Abdulkadir, Abubakar Amoo Akinlawon, Munzali Alhassan (Author)

This work is licensed under a Creative Commons Attribution 4.0 International License.
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References
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- [22] A. Rahman, C. Lin, and F. Wang, "Improving solar irradiance forecasting using GAN-based synthetic data generation," Sustainable Energy Technologies and Assessments, vol. 56, 103127, 2023.
- [23] S. Yadav, R. Singh, and A. Verma, "Transformer-based long-term degradation prediction for photovoltaic systems," Energy AI, vol. 14, 100281, 2024.
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References
[1] Y. Zhang, X. Li, C. Liu, and K. Wang, "A deep learning-based approach for solar irradiance forecasting using time series data," Renewable Energy, vol. 156, pp. 461–472, 2020, doi: 10.1016/j.renene.2023.01.102.
[2] A. A. Ahmed, "Ad Hoc Wireless Networks as Technology of Support for Ubiquitous Computation," in Intelligent Computing in Engineering: Select Proceedings of RICE 2019, Singapore: Springer, 2020, doi: 10.1007/978-981-15-2780-7_77.
[3] H. J. Mutasharand, A. A. Muhammed, and A. A. Ahmed, "Design of Deep Learning Methodology for Side-Channel Attack Detection Based on Power Leakages," in Proc. Int. Conf. on Computing and Communication Networks, Singapore: Springer Nature, 2023, doi: 10.1007/978-981-97-2671-4_16.
[4] M. J. Khan, M. Arsalan, and N. Javaid, "Deep learning-based solar energy forecasting and fault detection: A review," Renewable and Sustainable Energy Reviews, vol. 148, 111278, 2021, doi: 10.1109/ACCESS.2023.3270041.
[5] A. F. Alaswadi, N. M. Alyazidi, F. N. Al-Aswadi, and A. A. Ahmed, "Optimized fractional-order PID controller for temperature control of CSTH: a comparative study with PID cascade controller," in Int. Conf. on Energy, Power, Environment, Control and Computing (ICEPECC), vol. 2025, pp. 502–510, Feb. 2025, doi: 10.1049/icp.2025.1159.
[6] A. A. Ahmed et al., "Performance Analysis of Energy and Secure Efficient Routing for Wireless Sensor Networks," in Proc. Int. Conf. on Decision Aid Sciences and Applications (DASA), IEEE, 2024, doi: 10.1109/DASA63652.2024.10836506.
[7] F. Chen, J. Zhang, and Y. Wang, "CNN-LSTM based solar power forecasting model using weather condition data," Energy Reports, vol. 7, pp. 7466–7477, 2021, doi: 10.5626/ktcp.2020.26.10.435.
[8] A. A. Ahmed et al., "A Review of Key Elements for Underwater Wireless Sensor Networks," in Proc. Int. Conf. on Decision Aid Sciences and Applications (DASA), IEEE, 2024, doi: 10.1109/dasa63652.2024.10836609.
[9] P. Singh, S. Yadav, and P. Verma, "Deep learning techniques for solar panel degradation prediction: A review," Energy AI, vol. 9, 100168, 2022.
[10] A. A. Ahmed et al., "Empowering Smart Homes with Fog Computing for IoT Connectivity," in Proc. Int. Conf. on Decision Aid Sciences and Applications (DASA), IEEE, 2024, doi: 10.1109/dasa63652.2024.10836355.
[11] S. Sarkar, N. Dey, and A. S. Ashour, "Infrared image-based solar panel fault detection using convolutional neural networks," Sustainable Energy Technologies and Assessments, vol. 42, 100844, 2020, doi: 10.1109/iccit60459.2023.10441429.
[12] A. A. Ahmed et al., "Smart Water-Powered Renewable Energy System with IoT Integration," in Proc. Int. Conf. on Decision Aid Sciences and Applications (DASA), IEEE, 2024, doi: 10.1109/dasa63652.2024.10836602.
[13] A. A. Ahmed et al., "Enhancing Wireless Sensor Network Data Collection through Aerial Unmanned Vehicles," in Proc. Int. Conf. on Decision Aid Sciences and Applications (DASA), IEEE, 2024, doi: 10.1109/dasa63652.2024.10836384.
[14] Z. Wang, X. Li, and Y. Sun, "A reinforcement learning-based maximum power point tracking for PV systems under partial shading conditions," Applied Energy, vol. 323, 119679, 2022, doi: 10.1038/s41598-025-04733-7.
[15] A. A. Ahmed, R. A. Salim, and M. K. Hasan, "Deep learning method for power side-channel analysis on chip leakages," Elektronika Ir Elektrotechnika, vol. 29, no. 6, pp. 50–57, 2023, doi: 10.5755/j02.eie.34650.
[16] A. A. Ahmed et al., "Detection of crucial power side channel data leakage in neural networks," in Proc. 33rd Int. Telecommunication Networks and Applications Conf. (ITNAC), IEEE, 2023, doi: 10.1109/itnac59571.2023.10368563.
[17] H. Zhou, Y. Liu, and K. Wang, "Hybrid Transformer-LSTM model for solar irradiance prediction under dynamic weather conditions," Renewable Energy, vol. 199, pp. 1093–1104, 2022.
[18] P. Fernandez, X. Li, and A. Gupta, "Short-term photovoltaic power prediction using CNN-GRU architecture with satellite imagery," Applied Energy, vol. 330, 120303, 2023.
[19] R. Ahmed, S. Patel, and S. Roy, "CNN-based infrared image analysis for fault detection in solar PV modules," Energy Reports, vol. 8, pp. 5372–5384, 2022.
[20] N. Patel, V. Sharma, and A. Reddy, "Predictive maintenance of PV systems using autoencoder-LSTM models," Energy AI, vol. 12, 100242, 2023, doi: 10.1016/j.rineng.2024.103589.
[21] Z. Wang, Y. Sun, and L. Chen, "Reinforcement learning-based maximum power point tracking for PV systems under partial shading conditions," Renewable Energy, vol. 212, pp. 95–106, 2023.
[22] A. Rahman, C. Lin, and F. Wang, "Improving solar irradiance forecasting using GAN-based synthetic data generation," Sustainable Energy Technologies and Assessments, vol. 56, 103127, 2023.
[23] S. Yadav, R. Singh, and A. Verma, "Transformer-based long-term degradation prediction for photovoltaic systems," Energy AI, vol. 14, 100281, 2024.
[24] P. Kumar, V. Mehta, and R. Banerjee, "Edge-AI-enabled real-time fault detection for rooftop PV systems," IEEE Access, vol. 12, pp. 12055–12067, 2024, doi: 10.56472/iccsaiml25-129.
[25] T. Gao, Y. Wang, and H. Zhang, "Cross-regional generalization of deep learning models for solar power forecasting," Renewable and Sustainable Energy Reviews, vol. 176, 113282, 2023.
[26] J. Huang, P. Li, and S. Singh, "Deep learning applications for solar energy systems: A comprehensive review," Renewable and Sustainable Energy Reviews, vol. 184, pp. 113568, 2024, doi: 10.1002/er.5331.