<https://circuitsolar.com/choosing-solar-circuit-suppliers/#webpage>
<http://schema.org/description>
"When it comes to solar power, one of the most important solar suppliers is the power bank. The basic function of a power bank is to provide you with a store of energy for when the sun does not shine. It does this by converting the direct current (DC) energy into alternating current (AC). This means that there are several different ways in which you can use a power bank. One of those ways is to charge the batteries when they are not in use, and to draw power from the batteries when they are being used."
<https://circuitsolar.com/choosing-solar-circuit-suppliers/>