If the sun charges the solar battery after why do they hold chargers for solar battery?

YEP, THAT'S A LITTLE CONFUSING
Answers:
sun is the source for energy. the photocells produce the electricity by absorbing the sunlight activeness.
but imagine , base on amount of sunlight hitted the cells , they transduced it to related amount of electricity which way when it's clear and cells targeted strait to sun within is much produced voltage , camparing to cloudy days or at sunset.
the chargers are not very exact words for their function.they have get regulating circuits which control and smooth the voltage in some cases , obviously as a option, it charges the chargable battries to use contained by case of emergency or for using during night.


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