I'm designing a circuit that charges a battery with solar power. Im using the TP4056 for this. My question is the following. I want to use a transistor as switch to cut off the power if the battery is fully charged. (to prevent overcharge). And to drain the battery. (for demo purposes)
The transistor is controlled by an arduino pin.
I have the following schematic:
The solar panel is 5.5V and 170mAh.
- Am I correct that there is no current flowing between the panel and the charger ?
- How do I determine what the exact transistor should be if I want to interrupt the circuit. (5.5V before transistor, 5.5V after transistor) ?
- Is this even necessary. Does the TP4065 automatically shuts off ?
Many Thanks in advance !