Deep Feature Selection of Meteorological Variables for LSTM-Based PV Power Forecasting in High-Dimensional Time-Series Data Mauladdawilah, Husein Balfaqih, Mohammed Balfagih, Zain Pegalajar Jiménez, María Del Carmen Jadraque Gago, Eulalia Deep learning Forecasting Long short-term memory Accurate photovoltaic (PV) power forecasting is essential for grid integration, particularly in maritime climates with dynamic weather patterns. This study addresses high-dimensional meteorological data challenges by systematically evaluating 32 variables across four categories (solar irradiance, temperature, atmospheric, hydrometeorological) for day-ahead PV forecasting using long short-term memory (LSTM) networks. Using six years of data from a 350 kWp solar farm in Scotland, we compare satellite-derived data and local weather station measurements. Surprisingly, downward thermal infrared flux—capturing persistent atmospheric moisture and cloud properties in maritime climates—emerged as the most influential predictor despite low correlation (1.93%). When paired with precipitation data, this two-variable combination achieved 99.81% R2 , outperforming complex multivariable models. Satellite data consistently surpassed ground measurements, with 9 of the top 10 predictors being satellite derived. Our approach reduces model complexity while improving forecasting accuracy, providing practical solutions for energy systems. 2025-09-19T08:35:59Z 2025-09-19T08:35:59Z 2025-08-10 journal article Mauladdawilah, H.; Balfaqih, M.; Balfagih, Z.; Pegalajar, M.d.C.; Gago, E.J. Deep Feature Selection of Meteorological Variables for LSTM-Based PV Power Forecasting in High-Dimensional Time-Series Data. Algorithms 2025, 18, 496. https://doi.org/10.3390/a18080496 https://hdl.handle.net/10481/106464 10.3390/a18080496 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional MDPI