A solar power bank is essentially a portable battery pack with built-in solar panels. It captures sunlight via photovoltaic (PV) cells, converts it into electricity, stores it in an internal battery (usually lithium-ion or lithium-polymer), and later supplies power through USB (or sometimes wireless) outputs.
How They Work
Solar Panels: Sunlight is absorbed by silicon PV panels (mono- or polycrystalline), which generate DC electricity .
Charge Controller: Regulates current flow, protecting the battery from over- or under-charging.
Battery Storage: Charges are stored onboard, with capacities ranging from a few thousand to 10,000 mAh .
Output Ports: USB-A, USB-C, wireless pads, etc. Users connect their devices to draw power.
