Help: DIY Solar Li-Ion Battery Charger Answered
Heylo, I’m a mechanical engineer by trade but lately I have taken up a fascination in building some fun DIY electronics. I wanted to make a device that could charge 18650’s via solar and then could use those batteries to charge my phone. So I found an instructables tutorial that seemed legit so I bought the following things and tried to wire it all up: Dual 18650 Battery Holder TP4056 Protection Circuit MT3608 5V 2A Boost Circuit Voltmeter Screen So I wanted to kind of figure things out on my own so I wired things up without referencing anything and I’ve done it multiple times but I cannot get anything to work. I have attached photos for reference. Basically, I bought 2 18650 holders and pulled the switch from one and wired it to the other. My thinking was that if I had switches on both the positive and negative terminals, I could switch it between solar charging mode and battery powered mode. It doesn’t work at all and I’m not sure what I did wrong. None of the lights even turn on, on the TP4056 yet alone the LED on 5V 2A circuit. I feel like everything I did was sound. But it’s probably not. Please don’t judge my soldering ability, I know it’s awful. I’m learning and I have awful hand tremors which makes soldering especially difficult. Anyways, thanks for your help in advance. If you need any more photos please let me know.