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PSU For Multiple TP4056 Board
#1
Hi All,

Could anyone help me with recommending the correct sized PSU to power a board of TP4056.

I have a pack of Phillip Seidel's PCB's arriving so will have 10 x 4 Cell boards to power.

I have seen a that a few people have already built up some boards and they look awesome.


Can anyone help with advise what power supply I should obtain?

My maths (which is probably wrong) suggests the following....

40 x Tp4056 @ 1A Charging from a 5v supply - so 5v x 1A = 5W per charger 
40 x 5W = 200W

This seems way to low to me, where am I going wrong?

Something like this https://www.aliexpress.com/item/DC-5V-2A-3A-5A-8A-10A-12A-20A-40A-60A-70A-Lighting-Transformer-LED-Driver/32960088020.html?spm=2114.search0104.8.42.731b7d02T2ps8H&transAbTest=ae803_5

Thanks in Advance.
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#2
Your math is right! But if every TP4056 is a little imprecise and takes for example 1.05A you get 42A. It's always good to have some spare power if needed.
So I would get a PSU with 45Amps or more.
zoookii and Korishan like this post
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#3
A few ex PC power supplies might be cheaper, and likely more robust, than that single unknown one linked to.
Korishan and zoookii like this post
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#4
Thanks guys
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#5
I use computer PSU's and the 5V rail... I run 10 or so per PSU... bulky and its a wire cluster F^&k for sure, and  fan noise is an issue. but it works.
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#6
The problem with ATX power supplies is that 5V is only a minor rail nowadays. To get really big 5V rails you need to use really old power supplies and you don't really want to do that because of efficiency, quality and age issues.

As a quick example, just because I happen to have one right here on the desk: Enermax Platimax 750W, only 24A at 5V. So that's just 120W or 16% of its maximum power output. This scales down with the smaller units respectively. On old PSU designs you could get 40A on 5V even on small units.

I think the best solution is a powerful ATX PSU and then run DC-DC converters from its 12V rail. The DPS5020 can supply 20A at its output which makes it suitable. Three of them and you can power 40 TP4056s easily, up to ~50 maybe. Two for 40 is right on the edge so probably not the best idea. Also you can then attach a couple of 12V fans to the power supply because the TP4056s will have reduced performance due to heat issues.
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#7
Not saying you should do it this way but here is what I built and it works just fine and rather quiet
https://secondlifestorage.com/t-DIY-40-C...ging-board

The parts list is in the thread several posts down.

The PS is a server PS with plenty of wattage at 12 volts.
I do understand that there is some loss on the bucks but hey its a charger plus you can also use a 12 volt battery to charge the cells if you so desire. I plan on using one of my PV arrays to charge a 12V battery pack to feed the charger.


Wolf
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
Last count as of 6/10/2019
Total Number of Cells                          5940
Cells  >80% of Capacity                      4334
Cells <80% of Capacity                       1605
Cells ≥2200mAh & ≥ 80% & ≤75mΩ    2800 +236
For Info Google Drive
Not your average Wolf       
            Cool



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#8
(01-13-2019, 04:38 PM)Wolf Wrote: Not saying you should do it this way but here is what I built and it works just fine and rather quiet
https://secondlifestorage.com/t-DIY-40-C...ging-board

The parts list is in the thread several posts down.

The PS is a server PS with plenty of wattage at 12 volts.
I do understand that there is some loss on the bucks but hey its a charger plus you can also use a 12 volt battery to charge the cells if you so desire. I plan on using one of my PV arrays to charge a 12V battery pack to feed the charger.


Wolf
That looks awesome Wolf.

So if I used a Server PS like you into 2 x DPS5020 that would solve it.
I will get some pics up once all the parts arrive.

Cheers
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#9
(01-13-2019, 09:25 PM)zoookii Wrote: That looks awesome Wolf.

So if I used a Server PS like you into 2 x DPS5020 that would solve it.
I will get some pics up once all the parts arrive.

Cheers

zookii,

The DPS5020 is rated on the edge of the 20A you need. When I was searching for a 50A DC/DC buck I couldn't find one that was reasonable that's why I went with individual bucks for each board. https://www.aliexpress.com/item/1PCS-5A-XL4015-DC-DC-4-38V-to-1-25-36V-24V-12V-9V-5V-Step/32922879004 these are rated at 5A each with the heatsink.

The best I could find was these https://www.aliexpress.com/item/300W-20A...4c4dbJcirX but they recommend 15A normal and 20A max. It is Chinese so mostly overrated. I'm sure you know.

Not saying that the DPS5020 won't work just be aware you are on its upper limit.

I also wanted to avoid having to use 12 gauge (20A after all) wire in my setup as you notice each charging board is supplied separately.
So I have 12V going to the DC/DC bucks which draw 1.6A (22AWG wire)  to give me 4A (20AWG wire) at 5V. The voltmeters are just eye candy but its also nice to verify the voltage is within reasonable limits.
Now I did like the idea of the boards joining together but I was not to sure about the voltage drop across 5 boards so I again came to the conclusion separate Bucks for each board. I know its a lot of extra work but If one Buck goes down I don't lose half my board. Smile

If you got any questions just ask.

Wolf
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
Last count as of 6/10/2019
Total Number of Cells                          5940
Cells  >80% of Capacity                      4334
Cells <80% of Capacity                       1605
Cells ≥2200mAh & ≥ 80% & ≤75mΩ    2800 +236
For Info Google Drive
Not your average Wolf       
            Cool



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#10
(01-14-2019, 12:46 AM)Wolf Wrote:
(01-13-2019, 09:25 PM)zoookii Wrote: That looks awesome Wolf.

So if I used a Server PS like you into 2 x DPS5020 that would solve it.
I will get some pics up once all the parts arrive.

Cheers

zookii,

The DPS5020 is rated on the edge of the 20A you need. When I was searching for a 50A DC/DC buck I couldn't find one that was reasonable that's why I went with individual bucks for each board. https://www.aliexpress.com/item/1PCS-5A-...st=ae803_5 these are rated at 5A each with the heatsink.

The best I could find was these https://www.aliexpress.com/item/300W-20A...4c4dbJcirX but they recommend 15A normal and 20A max. It is Chinese so mostly overrated. I'm sure you know.

Not saying that the DPS5020 won't work just be aware you are on its upper limit.

I also wanted to avoid having to use 12 gauge (20A after all) wire in my setup as you notice each charging board is supplied separately.
So I have 12V going to the DC/DC bucks which draw 1.6A (22AWG wire)  to give me 4A (20AWG wire) at 5V. The voltmeters are just eye candy but its also nice to verify the voltage is within reasonable limits.
Now I did like the idea of the boards joining together but I was not to sure about the voltage drop across 5 boards so I again came to the conclusion separate Bucks for each board. I know its a lot of extra work but If one Buck goes down I don't lose half my board. Smile

If you got any questions just ask.

Wolf

I have gone with your suggestion Wolf and got some buck converters coming. Had a nightmare trying to get the small TP4056 boards that fit on Phillips PCB, but finally got some now.

Next PSU question is how to power 8 Littokala’s on a board. My current idea is another DPS-800 server PSU (as I have a few) and a 20A buck converter to get to 5v.

What have everyone else done?

Cheers.
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