Rock64 Cluster.

[fabricedupre]

Hi,
I'm making a cluster with three rock64.
Its work well with rock64 power supply.
Now a whant to replace these power supply by an unique one, witch can i use ?

Thanks in advance.

[fire219]

Any PSU would work, as long as it meets a few requirements:

• Stable 4.9-5.2V output. Don't just trust it if it says 5V. It may put out much less under heavy load and much more under minimal load.
  
• 3 amps per board. If you are running 3 boards, the power supply needs to be rated for at least 9 amps. More is fine, and is even preferable.
  
• Good cables/wire between power supply and boards. Wires that are too thin may make the voltage drop too low, and might even heat up and burn.
  

You'll also need to decide on if you want to power the boards through the barrel jack connector, or through the pin header. You'll probably have to do your own wiring, since power supplies that fit your need will be like this.

[MarkHaysHarris777]

I deleted all of your duplicate cross postings;  please don't do that again.

[fabricedupre]

I deleted all of your duplicate cross postings;  please don't do that again.

thank you, i apologise.

[fabricedupre]

Any PSU would work, as long as it meets a few requirements:

• Stable 4.9-5.2V output. Don't just trust it if it says 5V. It may put out much less under heavy load and much more under minimal load.
  
• 3 amps per board. If you are running 3 boards, the power supply needs to be rated for at least 9 amps. More is fine, and is even preferable.
  
• Good cables/wire between power supply and boards. Wires that are too thin may make the voltage drop too low, and might even heat up and burn.
  

You'll also need to decide on if you want to power the boards through the barrel jack connector, or through the pin header. You'll probably have to do your own wiring, since power supplies that fit your need will be like this.

thank you, i'm looking for a new power supply.

I started with an usb power supply who deliver 2.4a per port, but i really got 1.7a per port ;-)

[fabricedupre]

Any PSU would work, as long as it meets a few requirements:

• Stable 4.9-5.2V output. Don't just trust it if it says 5V. It may put out much less under heavy load and much more under minimal load.
  
• 3 amps per board. If you are running 3 boards, the power supply needs to be rated for at least 9 amps. More is fine, and is even preferable.
  
• Good cables/wire between power supply and boards. Wires that are too thin may make the voltage drop too low, and might even heat up and burn.
  

You'll also need to decide on if you want to power the boards through the barrel jack connector, or through the pin header. You'll probably have to do your own wiring, since power supplies that fit your need will be like this.

Hello,

I got a good PSU now, can i use the Pi-2 Bus (pin N°2 and N°6) to power my boards ?



Fabrice.

[martinayotte]

Sure ! as long as it is at least 5V while loaded.

[digitaldaz]

Something along these lines maybe?? http://cpc.farnell.com/stontronics/pd-10...es-PW03539

[rmbusy]

Something along these lines maybe?? http://cpc.farnell.com/stontronics/pd-10...es-PW03539

Nice supply (I have one similar to that), but a bit overkill.  It will work fine for what the OP is doing too.

I see folks saying 3+ amp supplies are required, but in reality, the actual requirement depends on what you're doing.  For example, I just powered up my Rock64 4G board from a Agilent 6626A power supply, to measure the current.  My board currently has the jessie-minimal-rock64-0.5.7-101-arm64.img running, with nothing else connected to the board, and it's consuming 192mA (0.192 amps).

Personally, I consider that my starting point, then I'll add to the power requirements as I plan to plug things in to it (although I usually have a 2A supply connected to it).

When in doubt though, go with more supply capacity, since any droop in the supply voltage (caused by overloading it) will likely manifest itself as serious system instabilities.

Correction: When taking the above power measurement, Ethernet was connected and active. Disconnecting the Ethernet cable causes the current to jump up a little, to about 205mA. When reconnected, once the link is established, it drops back to 192mA.

[pitsch]

any thoughts on these? 

planning to run 5 nodes, perhaps more. 

power supply (5V 15A 75W)
http://www.ebay.com/itm/5V-15A-75W-Power...SwwpdW54Xb

splitter cable 8 way
http://www.ebay.com/itm/HQRP-CCTV-Securi...xyRNJSlJJJ