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Two TP4056 Questions
#1
Hey everyone,

Been a while since I've posted anything, but now I'm back with another couple of quetsions re: tp4056 chip chargers.

Question 1: Is there any way to easily use these to charge up to storage state (3.7v) and stop?  I don't really want to add an arduino or anything...just a simple solution if possible.

Background for Question 2: I have watched many videos of people building charging stations using 5 - 50 of the TP4056 and powering them off of a 5v power supply with positive and negative bus bars to get the power out to all the chargers.  I have seen lots where the 5V power supply only puts out 5 amps but is being used for 10+ chargers.  The video makers claim that the TP4056 charge at 1 amp (which they do) so now in their charging stations they have 10+ TP4056 charging at 1 amp.  To me this math doesn't work.

Question 2:  Am I right in thinking that if I build a charging station with 10 TP4056 powered by a 5V 5A power supply, each TP4056 will really only be charging at 500mA?  If I want to have 10 TP4056 charging at a full 1A each I'd need to have a 5V 10A power supply - right?  I know that I'm using rough math here since the TP4056 is only going to 4.2V there would be a little more amperage...I'm just too lazy to do the math right now.

Thanks,

Eric
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#2
1: No, it always goes to 4.2V

2: If the power supply limits to 5A while keeping the voltage up, then yes. If not then you will overload the power supply or the TP4056 will just shut down because the voltage will drop. Or both. For ten of these you want a 5V power supply with 10A at least, yes.
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#3
Q1: I would have to agree with DarkRaven. This is very difficult (I believe) to change. Maybe some kind of feedback to trick the TP4056 into thinking the voltage is higher, but then, this would change the charging curve, too.

Q2: The PSU will put out a CV/CC (on most of them, anyways). The TP4056 will use as much available Amps as it can. However, we have to also take into consideration of the charging current curve. It's not a flat line like lead acid. So, it is quite possible to have 10 units charging and they all together be pulling less than 10amps; just depends on where they are at in the charging cycle.
Eric Koshinsky likes this post
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#4
I always spec out a slightly higher Amp rating PS for the max load of tp4056's Right now I have 10 of them and 5 Zb2l3 Dischargers on a 40Amp 5V PS Max draw I have seen has been 10.5Amps
******Hi My name is Jason and I have SOCD (Solar Obsessive Compulsive Disorder)*******
Current Powerwall - 1400 Cells 7s200p (modular 40p packs) ~ 12kWh of storage     4x 315W Canadian Solar Panels

Working on the next 7s40p packs     ~2.5kWh

Waiting on 2000 Cells of unused Sony vt4 (2000mah 30A) ~ 15kWh      hehehehehe  More Power
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#5
Thanks for the info folks. All as I expected. Good to clarify though.

Hey jdeadman.... do you have a link or name/brand for that 40A 5V power supply? Max I can find around here is 12A.

Thanks.

Eric
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#6
Seasonic has a range of industrial power supplies, among them are also 5V models like the SSE-2001TF-5: https://seasonic.com/product/sse-2001tf-5/
This supplies 200W, 40A at 5V. They even have bigger ones if needed.
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#7
(10-11-2017, 05:39 PM)Eric Koshinsky Wrote: Question 1: Is there any way to easily use these to charge up to storage state (3.7v) and stop?  I don't really want to add an arduino or anything...just a simple solution if possible.

I stop mine charging at 4V using a schottky diode, with a 0.2V forward voltage in series with the battery. I also added a switch across the diode so I can easily choose 4V for storage or 4.2V for testing.
It seems to confuse the TP4056 slightly in that both the red and green leds light up sometimes when it hits 4V, but other that that it works great.
I guess a diode with a FV of 0.5V may work to get you 3.7V, but I haven't tried it.

This is my rig:
The two cells on the left are charging to 4V as they are tested and the other two are switched for charging to 4.2 ready to go into the Opus.


I didn't need to use those huge diodes (40L15CW), but I had free access to some, so they were the right ones. Big Grin
Crimp Daddy, Rad, mormor1971 like this post
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#8
(10-11-2017, 07:59 PM)Eric Koshinsky Wrote: Thanks for the info folks. All as I expected. Good to clarify though.

Hey jdeadman.... do you have a link or name/brand for that 40A 5V power supply? Max I can find around here is 12A.

Thanks.

Eric
Not with me but it's just a 350w computer power supply. So I get 18amps of 12v and 40amps of 5v. Max load which I would never run close to.
******Hi My name is Jason and I have SOCD (Solar Obsessive Compulsive Disorder)*******
Current Powerwall - 1400 Cells 7s200p (modular 40p packs) ~ 12kWh of storage     4x 315W Canadian Solar Panels

Working on the next 7s40p packs     ~2.5kWh

Waiting on 2000 Cells of unused Sony vt4 (2000mah 30A) ~ 15kWh      hehehehehe  More Power
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#9
crap...I wish I new more and had more experience with this stuff. Your setup looks like a nice simple and elegant solution. My lack of knowledge/experience means I can't even think up a solution like that.

Thanks watts-on. now I just have to figure out how to build it from the pics.... (or ask nicely if you have sketch plans ;-)

Cheers.

Eric
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#10
(10-11-2017, 10:51 PM)Eric Koshinsky Wrote: .... (or ask nicely if you have sketch plans ;-)

Ok, since you asked nicely... Blush

Gerard Achternaam, Crimp Daddy, hermitdave And 1 others like this post
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