Introduction: Solar Power Bank
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Step 1: Parts and Schematic
I have designed 2 variations, depending on the power output you require. One that outputs up to 30V via a DC Jack and another that outputs 5V via a standard USB jack.
Connect as shown in the relevant schematic diagram (If using the solar panel, solder this last as you will need to feed the cable through the lid).
You will need:
TP4056 Li-Ion Battery Charge Controller: https://www.banggood.com/custlink/KGmmYIsB5L
TP18650 3.7V Li-Ion Battery (2600mAh): https://www.banggood.com/custlink/KGmmYIsB5L
6V 4.5W Mono crystalline Solar Panel: https://www.banggood.com/custlink/KGmmYIsB5L
5V 1A USB Step Up Converter: https://www.banggood.com/custlink/KGmmYIsB5L
MT3608 DC Boost Module https://www.banggood.com/custlink/KGmmYIsB5L
Step 2: Assembly
Assemble the components within the 3D printed housing (If using the DC boost converter be sure to adjust to the desired output voltage before installing). Insert two 18650 (3.7V) batteries. Secure the DC jack in place using hot glue, similarly attach the lid and solar panel.
Charge up the battery pack using the micro-usb connection, alternatively place in bright sunlight.
Attach your USB or DC jack powered device and enjoy some free energy!