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frankv
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  #2581496 8-Oct-2020 16:36
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Paul1977:

 

So I assume this one, or similar, would be more than sufficient?

 

But how do I connect the pis to it? Just connect all four in parallel to the output terminals?

 

 

Yes, connect them in parallel... GND & 5V to each RPi. Don't daisy-chain them -- in that case to carry 12A the wires from the PSU to the first RPI would need to be 11AWG (2.3mm diameter conductor!) (https://www.powerstream.com/Wire_Size.htm). For 3A, you only need 1mm dia conductors. At low voltages, shorter wires (within reason) are better.

 

NB: Cheap USB cables have less than 1mm dia wires

 

 


huckster
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  #2581550 8-Oct-2020 18:24
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Keep us posted on which way you go. I bought an Anker but it doesn't cut it for the newer Pis.


 
 
 
 


Paul1977

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  #2581793 9-Oct-2020 09:56
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huckster:

 

Keep us posted on which way you go. I bought an Anker but it doesn't cut it for the newer Pis.

 

 

@huckster I'm almost certainly going to go the passive PoE hats I linked above, but will be a few weeks to get them from China.

 

I'm fortunate that I already have a switch capable of passive 24V PoE. They're half the price of the official 802.3af hats, and can also output more amps / higher wattage (15W vs 12.5W) - so for me I can't see a downside.

 

Once I get these I'll let you know how they go.


Paul1977

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  #2581851 9-Oct-2020 11:20
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Another question:

 

What are peoples thoughts on cooling requirements for the Pi 4 Model B?

 

I'm looking at getting a case with multiple layers and open sides so I can stack the Pis, but not sure if I need active cooling? The PoE hats I'm looking at come with a heat sink for the CPU, but has some pins that may prevent a fan being able to be placed above CPU.

 

They will be in a small 9RU network cabinet in garage that has fans running (but a large switch will prevent the fans blowing directly on the Pis).

 

PoE Hat and Heatsink

 

Layered case without fans

 

Layered case with fans, but suspect pins on PoE hat will be in the way of fans?


richms
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  #2581876 9-Oct-2020 12:41
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You can always get some longer standoffs to space things out furthur if the fans hit. 

 

I only have single pi's deployed and half of them are just running emulators which dont seem to really stress it enough to even need a heatsink.





Richard rich.ms

Paul1977

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  #2581881 9-Oct-2020 12:56
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richms:

 

You can always get some longer standoffs to space things out furthur if the fans hit.

 

 

That's a good point, thanks.


PANiCnz
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  #2581973 9-Oct-2020 16:02
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Have you seen this case? Would probably provide the best cooling performance.


 
 
 
 


Paul1977

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  #2581978 9-Oct-2020 16:13
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PANiCnz:

 

Have you seen this case? Would probably provide the best cooling performance.

 

 

No, hadn't seen that one. Probably quite a good option, but perhaps a little bulky?

 

A bit late for me as I've ordered this one now anyway, which I'm hoping will do the trick and take up less space if I lay it on it's side. From the same seller I notice.


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