Electrical – power multiple devices from a single power supply

power supply

I'm planning on building a device that has the following requirements:

  • 4x devices that are rated as 5v (1.5 amps normal load, however during high loads can require upto 2 amps)
  • 1x raspberry pi

I've sourced a power supply that takes 240 AC mains supply and provides 5v @ 8 Amps.

My plan is to connect all the devices in parallel.

My questions are as follows:

  • Is this power supply a good idea?
  • When the system is idle, will this be an issue, i.e. the devices are not drawing maximum current?

Please advise!

EDIT

This is the kind of power supply I'm planning on using, I don't know if that helps?

http://www.ebay.co.uk/itm/DC-12V-24V-5V-Universal-Regulated-Switching-Power-Supply-for-LED-Strip-CCTV-UK-/291087849273?var=&hash=item43c6301739:m:m6INReCcQQadil-AVWF6qsQ

Best Answer

4x devices that are rated as 5v (1.5 amps normal load, however during high loads can require up to 2 amps)
1x raspberry pi
I've sourced a power supply that takes 240 AC mains supply and provides 5v @ 8 Amps.

The RPI can see up to 1 Amp draw, or higher. Some take 0.5A by themselves with nothing plugged in.

So you have a system that takes 6.5 Amps normally, but can jump to 9 Amps during high load.

8 Amps is less than 9 Amps.

So No, that supply isn't a good choice for this.