It would help if you can give direct links to the project parts used in this demo. Is there a kit with all of these parts assembled available online for purchase. @@TechIdeasAG
You should have given a 1N4007 diode to the solar panel and connect the battery to the cathode of the diode (Anode to the solar panel so that cathode acts as the output)so that the current from the battery doesn't flow to the solar panel because it causes the solar panek to heat.
its over complicating a simple task that doesnt need a circuit to do also its drawing power 100% the time so its not efficient plus itll be dead long before the day is out
It would help if you can give direct links to the project parts used in this demo. Is there a kit with all of these parts assembled available online for purchase.
I know I'm late to the party but... where's the overcharge protection? You're trying to charge a lithium cell to near 5v but one should never overcharge a lithium cell. 4.2v is tops for a lithium charger. Highly likely that this thong will go up in flames one day.