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#272423 24-Jun-2020 11:30
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I am waiting a slightly strange need . In Simple Terms a UPS. I need to run a RPi on Batteries but be able to charge the batteries without losing power.

USB Power In-> TP4056 BMS ->  4P (4*18650 in Parallel) -> DCDC Convertor back to 5V -> USB Output -> Raspberry Pi

https://www.trademe.co.nz/electronics-photography/other-electronics/electronic-components/other/listing-2675078822.htm?rsqid=66e5c15bdf64448f8e14eb04436bc668-002
https://www.trademe.co.nz/electronics-photography/other-electronics/electronic-components/other/listing-2666170173.htm?rsqid=9af0747b878f4e00a17ca78d9a70bf36-001

 

Or would a 4S be better and use a different BMS and DCDC Convertor

 

https://www.trademe.co.nz/electronics-photography/other-electronics/electronic-components/other/listing-2674136832.htm?rsqid=a09090d874a9432aa5062dca3d839f88-001
https://www.trademe.co.nz/electronics-photography/other-electronics/electronic-components/other/listing-2674189456.htm?rsqid=b3fc14234c7644f8989b46ef352b4f7a-002

 


There is this which is already made

https://www.aliexpress.com/i/4000337496660.html

But I cannot find it available in NZ.

 

 

 

 


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  #2511543 24-Jun-2020 16:13
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Just order that one from Alix. There should not be a problem.


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  #2511631 24-Jun-2020 17:39
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Yes that will work. Remeber to add battery protection, 18650s are fun when they get warm ;)





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Any comments made are personal opinion and do not reflect directly on the position my current or past employers may have.

 


 
 
 
 


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  #2511666 24-Jun-2020 19:06
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I guess you are discussing 18650 Lithium Ion batteries.

 

I have used a few 18650 LiFePo4 batteries and had no problems. (from Aliexpress)

 

 





Gordy


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  #2511685 24-Jun-2020 19:34
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Adafruit make something like you want - https://www.adafruit.com/product/2465 

 

But not sure if it would handle 4 18650s?


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  #2511797 24-Jun-2020 21:05
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LennonNZ:

 

I am waiting a slightly strange need . In Simple Terms a UPS. I need to run a RPi on Batteries but be able to charge the batteries without losing power.

 

 

Sound idea, I'm looking to do something similar.

 


LennonNZ:
USB Power In-> TP4056 BMS ->  4P (4*18650 in Parallel) -> DCDC Convertor back to 5V -> USB Output -> Raspberry Pi

https://www.trademe.co.nz/electronics-photography/other-electronics/electronic-components/other/listing-2675078822.htm?rsqid=66e5c15bdf64448f8e14eb04436bc668-002
https://www.trademe.co.nz/electronics-photography/other-electronics/electronic-components/other/listing-2666170173.htm?rsqid=9af0747b878f4e00a17ca78d9a70bf36-001

 

 

Pi's can draw quite a bit of current up ~2A, and the modules you've listed probably won't cut it.

 

You will need to take into account charging current and the Pi current for the BMS, probably ~2.5A, and the Pi current ~2A for the Convertor. 


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  #2511805 24-Jun-2020 21:31
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They are hard to get "simply" - I need one for a torch and have not yet found one I feel comfortable with except Nitecore. I do not like the iffy branding on most of them.








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  #2511830 24-Jun-2020 22:40
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I ordered 2 of the ready made ones from aliexpress from different sellers

Yes I could find high amp BMS and step down transformers but hopefully the ready made ones works better.
I have a rather large (and heavy) Powerbank at the moment and if the devices don't work well a lot of the ravpower powerbanks have passthru charging.

The project is something like an improved version of http://74.69.57.190/

I expect the unit to self charge itself when not in use via wireless charging or magnetic usb interface.

 
 
 
 


neb

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  #2512153 25-Jun-2020 13:41
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There are quite a lot of UPS Pi HATs that do this, Google ups pi hat. Here's one from Australia which might be quicker than the Ali one, which will take at least a month to get here.



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  #2512183 25-Jun-2020 14:47
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Anything is faster than Aliexpress to get here.

 








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  #2512187 25-Jun-2020 14:52
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LennonNZ:

 

Anything is faster than Aliexpress to get here.

 

 

Except AusPost Economy. Suspended until further notice...


neb

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  #2512197 25-Jun-2020 14:59
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Aliexpress is hit-and-miss, during the lockdown I got stuff from there in two weeks vs. the more usual one-month wait. At the moment there seems to be a roughly one-month delay between "hand over to airline" in China and "arrived in destination country". Mind you shipping from the US is just as bad, if they'll ship at all.

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  #2512249 25-Jun-2020 15:04
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LennonNZ:

 


The project is something like an improved version of http://74.69.57.190/

 

 

Clicking on this at work was a bad idea... IT guys rang me asking to detail where I had been in the past 30 mins, website ran a python script and they thought we were compromised. 


neb

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  #2512256 25-Jun-2020 15:12
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Nate001:

IT guys rang me asking to detail where I had been in the past 30 mins, website ran a python script and they thought we were compromised. 

 

 

Good on them for being proactive, that's better than probably 99.9% of workplaces.

 

 

And why were you posting to GZ from work?



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  #2512258 25-Jun-2020 15:13
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Did you have fun driving the robots around?

Hopefully you didn't ram the cat (if it was there)

neb

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  #2512268 25-Jun-2020 15:20
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LennonNZ: Did you have fun driving the robots around?

Hopefully you didn't ram the cat (if it was there)

 

 

One of them seems to be stuck against the wall.

 

 

Hang on, IT department is calling....

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