Maximum Power Point Tracking Solar Powered Computer
Explanation of design
The battery is connected to the IN pin of the INA3221 so that it can measure the current battery voltage.
This has to be considered when asking for the charging voltage of the buck converter. It is reduced by the shunt
IR2104 logic input 3.3 Volt
automatic reset fuse (PPTC))
cheapo PPTC has 1.3 Ohms.
littelfuse has models with 0.01 Ohm!
Battery protection current limiter