My project is a solar powered RC car with the ESP32. Currently, I´m looking for a solar charge controller. I have two solar panels that deliver 3,5W at 6V. I want to charge Li-Ion or LiPo batterys. I need about 3A/ 5V for my project. My idea was to use the TP4056 charge controller. I tried to get information about it, but every site I visited said something different and I´m confused right now... Here are my questions:

  1. Does the TP4056 come with battery protection? (Over charge, over discharge, short-circuit-protection, ...)

  2. Can I charge multiple batteries with one TP4056? If I for example would use 18650 batterys, I would need three of those in parallel to give me the ammount of current I need. Can I charge them all with one TP4056? Or would I have to charge each battery with a seperate TP4056?

  3. If I would have to use three charge controllers: How would I wire them, so all batteries can be used in parallel (to give me the amount of current I need) as a power source and can all be charged at the same time?

  4. Is the TP4056 even the right charge controller for my project? If no, is there another one, that you would recommend?

Thanks for your help! 🙂


1 Answer 1

  1. No. Protection needs to be separate, unless the cells or pack already has built in protection.

  2. Multiple cells in parallel is just one large cell. You can use a single TP4056 but it would just take very long to charge with 1A.

  3. If the pack already has multiple cells in parallel, it is just one large cell. Not possible to charge each separately with TP4056 for each cell. You also can't use multiple TP4056s in parallel for increased current.

  4. No it does not seem like suitable, but suggesting a product or what to buy is off-topic.

  • \$\begingroup\$ Thanks for your answer! A question to 2.: That cell would have the same voltage output but more current then, right? And could I charge it while powering my project with it at the same time? \$\endgroup\$ Apr 30 at 20:03
  • \$\begingroup\$ Yes one large cell with larger capacity and current. Not with TP4056. Current can either go into battery, or out of it, or be zero. You can't charge with TP4056 while a load draws current. \$\endgroup\$
    – Justme
    Apr 30 at 20:20
  • \$\begingroup\$ So if I understood this correctly, I can charge three 3,7V Li-Ion batteries in parallel with one TP4056, but I can´t charge while powering my project with it? \$\endgroup\$ Apr 30 at 20:26
  • \$\begingroup\$ That is correct. \$\endgroup\$
    – Justme
    Apr 30 at 20:28
  • \$\begingroup\$ Ok, thank you so much, that helped me a lot! \$\endgroup\$ Apr 30 at 20:29

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