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Real‐time estimation techniques are presented to estimate solar irradiance and photovoltaic (PV) module temperature simultaneously from maximum power point condition. An algebraic equation which is function of PV output voltage and current measurements is utilised to estimate solar radiation. A non‐linear model‐based technique of immersion and invariance is employed to derive an update low for module temperature estimation. It is shown that the estimated temperature globally asymptotically converges, where its accuracy depends on solar radiation estimator. The proposed algorithms are accurate, fast, and easy to implement at optimal operating conditions of PV modules. [ABSTRACT FROM AUTHOR]