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Thermoelectric generators (TEGs) are used in a wide range of applications to convert heat into electricity. Heat waste recovery systems or radioisotope thermoelectric generators (RTGs) are examples of such applications. In most scenarios, TEGs are operated with limited heat flux sources where the temperature difference across the TEG cannot be considered as constant due to the induced Peltier effect, which is considered as parasitic in electrical power generation systems. A proper understanding of the behavior of a TEG under constant, or limited, heat flux, along with the transient response to load changes, is fundamental for the development of optimal maximum power point tracking (MPPT) control techniques. Most MPPT control techniques developed for TEG applications optimize the power generated when the TEG operates under constant temperature gradient but are not optimized when the device operates …