KingJack
Posts: 1
Joined: Fri Jul 05, 2019 9:52 pm

Power Supply for multiple RAPI4B+

Fri Jul 05, 2019 10:18 pm

Hi All,

I am setting up a cluster with the Raspberry Pi 4B+ out of interest, ( 2 RAPI4B+ and another cluster of 3 3B+)and I have a question around providing power to them all.

Extra power requirements for the setup is running an M.2 SSD drive (30mw-10w) through one of the Pis USB3 ports and active cooling for each pi va dual fans on each pi (.45W). Yeah, I know the M.2 is overkill, but hey, I'm doing it because I can.

I would like to avoid having individual wall worts (one for each pi), but I am struggling to find a USB charging station which provides 5V/3A to say 4 ports. Some USB charging stations have one port providing 5V/3A and the rest are 5v/2.4A - which of course is under the requirement for the RAPI4B+.

I would rather avoid the complexity and costs associated with POE. Likewise, I would like to keep the total power consumption down (with Power costing 35c per KW here in Australia).

Does anyone have any suggestions on options they're looking at?

mem314
Posts: 1
Joined: Mon Jul 08, 2019 2:45 pm

Re: Power Supply for multiple RAPI4B+

Mon Jul 08, 2019 2:56 pm

I'm looking at the same situation.

So far I haven't found any good multi-port USB bricks that can deliver the required power on multiple ports at the same time (there's plenty out there that will deliver the required power over one port). I'm eager to read what other people have found and tried out, but my current best bet is going with the PoE route. The official power supply is 15.3 W, so a 65 W / 4 port PoE switch should be capable of powering up to 4 devices.

I know the cluster powering the site at launch date was running with PoE, but does anyone else have any experiences to share?

alphanumeric
Posts: 1916
Joined: Tue Jan 19, 2016 2:17 pm
Location: Sydney, Nova Scotia, Canada

Re: Power Supply for multiple RAPI4B+

Mon Jul 08, 2019 3:22 pm

I have one of these, https://www.adafruit.com/product/658 It's 5V and up to 10A. Barrel connector though. I just plug it into this, https://www.adafruit.com/product/610 panel mount jack. Then feed my Pi, 7 inch touch screen, audio amp, etc with wires and connectors from there. Its a portable bread boarding rig. I also sometimes plug a couple of other Pi's in with splitters and adapters. An internet radio and a weather station that I take out on my deck in the summer. Saves me carrying out multiple supplies and using up all the plugs in my power bar.

https://www.adafruit.com/product/1352
https://www.adafruit.com/product/2727

W. H. Heydt
Posts: 10603
Joined: Fri Mar 09, 2012 7:36 pm
Location: Vallejo, CA (US)

Re: Power Supply for multiple RAPI4B+

Mon Jul 08, 2019 4:21 pm

Minor nitpick...
There is no "Pi4B+". There are three versions of the Pi4B.

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Imperf3kt
Posts: 2554
Joined: Tue Jun 20, 2017 12:16 am
Location: Australia

Re: Power Supply for multiple RAPI4B+

Mon Jul 08, 2019 10:56 pm

Use something like this
https://au.element14.com/mean-well/rs-2 ... dp/2816014

Note, this is the first Google result I got by searching "5v psu", it is only rated 5A, so is merely to show what to use, not a suggestion.
55:55:44:44:4C
52:4C:52:42:41

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TimG
Posts: 285
Joined: Tue Apr 03, 2012 12:15 am
Location: Switzerland

Re: Power Supply for multiple RAPI4B+

Mon Jul 08, 2019 11:22 pm

The official RPi power supply is actually hard to beat on price and reliability. There are industrial power supplies which would be more compact, but good ones aren't cheap -- especially once you factor in cabling, connectors, and a ventilated case.

Cheaper power supplies are the cause of endless difficult-to-diagnose problems, and it comes as a relief when they die completely. If you have an unused desktop PC power supply lying around, made by a reputable manufacturer and capable of driving 10A at 5V, it may be worth using.

PhatFil
Posts: 1309
Joined: Thu Apr 13, 2017 3:55 pm
Location: Oxford UK

Re: Power Supply for multiple RAPI4B+

Mon Jul 08, 2019 11:56 pm

I would suggest, look at 5V led switch mode psu's with a suitable amp overhead,
https://www.amazon.co.uk/BTF-LIGHTING-A ... V9BDA5S6N6 perhaps?
(**just an example not a recommended model/seller!!)

add some micro usb and usb-c male plugs to solder power wires to and a tidy junction box for the terminal block...

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davidcoton
Posts: 3946
Joined: Mon Sep 01, 2014 2:37 pm
Location: Cambridge, UK

Re: Power Supply for multiple RAPI4B+

Tue Jul 09, 2019 8:35 am

PhatFil wrote:
Mon Jul 08, 2019 11:56 pm
I would suggest, look at 5V led switch mode psu's with a suitable amp overhead,
https://www.amazon.co.uk/BTF-LIGHTING-A ... V9BDA5S6N6 perhaps?
(**just an example not a recommended model/seller!!)

add some micro usb and usb-c male plugs to solder power wires to and a tidy junction box for the terminal block...
If you power multiple Pis from a high-capacity 5V supply, you should add a polyfuse to each individual Pi. The Pi4B no longer has an on-board polyfuse, so this is necessaryu even if you use the USB-C connector for power. Similarly Pi0 models. Pi1,2,3 do not need an external polyfuse if powered via the micro-USB connector.
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