Hello, i've been reading a lot lastly to improve my understanding, here i come with questions!
Ah, like this:
Well yes that's going to gradually switch off the Arduino and LEDs as the sunlight increases. Some hysteresis
might be good to have (large value resistor from fet drain to NPN base could do this).
Nothing to prevent overcharge of battery through... It will be trashed if you don't protect it.
Sizing the battery to last overnight after an overcast day means that it will be 10x overcharged on
a sunny day...
Yes you got it right about the circuit!
Why do you say "gradually"? I've read that solar panels are almost on/off devices, meaning a slight light is enough for providing the design voltage, only the amount of current varies...
I've read about hysteresis and even though i think i've understood the global concept, i don't understand how it applies here, could you elaborate please?
Now about the battery (replying to Idahowalker too): i plan to buy a LiFePo4 (max 7.2V so i guess it's a 2-cell one, 3000mAh).
So the TP4056 won't work i guess. I have found that BQ24105 could be working. Circuits look pretty complicated though.
One thing which isn't clear is that sometimes i read battery stop charging when its voltage equals the incoming voltage, so why do you say it'll burn?
Also a more global question: is it a good idea to try to build stuff myself (meaning not using IC, only basic components) in order to learn better, or not?
Thanks, i keep getting myself informed!