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Laptop, router, modem, rope lights, phone chargers, 3D printer, and my eWheel charger. An MPPT charger needs something to put a variable amount of energy into: either a battery or an AC electric grid.
The phone uses an ESP32 at its core, ... A small battery is included as well as all of the support circuitry for charging it as well as a USB interface that can communicate to a PC.
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