Efficient power coupling in directly connected PV-battery module

Coupling of photovoltaic (PV) devices with energy storage such as batteries is essential to stabilize PV electricity supply. In this work usability of simple direct PV-battery coupling is investigated under realistically varied irradiance, temperature, battery state of charge (SoC), and applied load. A stable power coupling factor above 90% is demonstrated between a silicon heterojunction (SHJ) solar module and Li-ion battery in the wide range of SoC and load power. In the region of highest power generation, the directly coupled PV-battery module provides coupling efficiencies above 95%, reaching 100%, in realistic conditions. We demonstrate that direct PV-to-battery coupling is feasible for a variety of practical applications and scales.

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https://onlinelibrary.wiley.com/doi/full/10.1002/solr.202200857