Efficient solar charging of a battery has been demonstrated
in
the past by sizing batteries many times that of a solar cell to reduce
the effective current density experienced by the battery. Although
efficient, such a strategy of coupling a battery up to 10 times larger
with a solar cell will make solar–battery integration more
challenging and limit the size, and thus maximum power output, of
an integrated device. Area matched LFP-LTO (lithium iron phosphate,
lithium titanate) battery solar charging using high voltage lead halide
perovskite solar cells with a boost converter gave a maximum overall
efficiency of 9.9% and a high 14.9% solar to battery charging efficiency.
Two differently sized systems were compared using the same converter,
and an exergy analysis was performed, showing limitations of converter
usage in solar-powered internet of things (IoT) devices and size dependent
battery losses.
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