Internal resistance of a tree-based power source

A standing tree and its surrounding soil form a renewable energy generator, which is expected to provide a brand-new power supply scheme for low-power electrical equipment in forestry. However, parameters of this power source are unclear, which has caused great difficulties in its applications. Relevant literatures mainly focus on the voltage generation and variations. The internal resistance of the tree-base power source has not yet been intensively studied in relevant literatures. However, the internal resistance of a power source is also an important parameter to be considered during energy harvesting and utilization. This study aimed to preliminarily ascertain the characteristics of the internal resistance of this energy generator and to provide a reference for applied research. A measurement of the internal resistance was conducted on a poplar tree for more than one year. The results show that the internal resistance of the tree-based power source in this study was large, typically in the range of 1 ...

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