TP4056 two fast questions

Projects General Guidance
1

Hi, i have bought 5 of this TP4056, and they works fine charching 1 battery 18650.
I have 2 questions:

  1. how can i put the tp4056 in such a way that the battery powers the circuit but when i insert the cable in the tp4056 it charges the battery? if so, would the circuit stop or continue to run meanwhile the battery is charging?

  2. After the first question, i would like to know which would be the characteristic for a solar pannel to recharge the 18650. I mean the voltage, the Watt, the Ampere.
    Because i want a solar pannel that recharge my battery 18650 meanwhile the circuit is connected to the battery (so i hope it last for really long time). The circuit connected uses 3.5 mah and every minute, for 3 second it uses 15mah. I think would be more the recharge than the discharge of the battery, isn't it?

I hope i was clear. Thanks all.

2

The tp4046 can be used to charge the battery with a solar cell while running on the battery. I found 6 V's to the TP4056 to works better than 5V to the TP. The TP will wear out the batteries in about 4 to 6 months and Li does not work well when temps turn freezing.

Just connect the load to the TP output.

If you are interested in a better solution, I'd use 12V solar panels connected to a reverse flow prevention diode then a MPPT charge controller.

A lead acid can work, I use LiFeP04's.

3

Thanks for the reply,
So you are saying that my idea would not work because the tp4056 will consume more than charging?
For the first question?

4

I did not 'say' that your idea would not work. One might be able to discern from post#2 that I have used a solar cell and a LiPo and a TP4056 to power a project.

The TP4560 can deliver 1amp output to charge the battery/load supply.

5

For example this video Solar powered ESP32 IoT Sensor | Runs forever on sunshine! BUILD VIDEO! - YouTube could be what i want? The solar panel that charge the battery and meanwhile it powers the circuit?

6

Sure you could try that.

7

The video use this solar panel: solar panel 6V 0.6W
Could i use this one? that have 6V, 0.6W but here says 100mah (and the one from amazon doesn't says that mah): solar panel 6V 0.6W 100mah (the option 6V 0.6W etc...)

8

Have you measured the current draw of your project? If so then use those measured numbers to determine run times and charge requirements.

9

Yes, in idle (or in deep sleep) it uses 3.5 mah, and every 1 minute it uses for 3 second 15 mah.
So I think it's ok 100mah, right?

10

That's a good starting point.

11

Ok thanks for your time, I will try this project.

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12

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