Effective solution to extend the lifespan of the LIFEPO4 battery by minimizing temperature variation

Energy storage is an essential point for defining both the energy capacity of the off-grid photovoltaic system and ensuring the longest possible exploitation of the battery group. The life of batteries depends on how they are operated as well as how they are stored. We will refer in this paper only to the aspect of their storage. We focused on demonstrating that proper storage can ensure a constant optimal operating temperature at negligible cost. Earth's energy is an essential component of the innovative battery storage system. The reduction of thermal fluctuations specific to the seasons becomes achievable by using underground thermal energies. In addition, the proposed storage system involves the recycling of decommissioned or discarded refrigeration equipment casings from manufacturing, eliminating the costs of recycling and the carbon footprint induced by the related processes. The measurements were obtained during the experiments with an IoT device based on the ESP32 controller developed by the authors which will be the subject of a different paper. Thus, with extremely low costs, energy storage becomes ideal from a thermal point of view, regardless of the succession of seasons, in a continental temperate zone. The scientific work is a synthesis of the resulted experimental data that create a perfect profile for the innovating system behavior.