0
\$\begingroup\$

I have be trying to research how I would go about powering 3 Raspberry Pi devices using only 1 outlet. The raspberry pi require 5v and a max of 2a. I think I know just enough about electronics in general to apply any answers I find here. I am capable of diy what I need to.

Could I purchase a simple 9v ~1a wall wart power supply and split the dc 9v dc power over 3 buck converters that will step down to 5v? Place a diode in before the buck converter for protection?

Any and all advise os greatly appreciated. Thanks.

\$\endgroup\$
  • 1
    \$\begingroup\$ If all 3 devices are 5V, why not just get a 5V power adapter that has enough current output for all 3 devices? (so if each device needs 500mA just use 2A adapter) \$\endgroup\$ – I. Wolfe Mar 7 '15 at 15:52
  • \$\begingroup\$ According to raspberrypi.stackexchange.com/a/1183 it looks like the Pi doesn't need 2A - tests max out around 500mA. Like Wolfe says, any adapter that can source at least 1.5A can supply power for 3 devices (at 500mA each). \$\endgroup\$ – Greg d'Eon Mar 7 '15 at 16:19
  • \$\begingroup\$ More amps are needed for usb addons. I.E. wifi dongle, usb keyboard and mouse. I wanted to create a system that allowd flexibility. \$\endgroup\$ – Catalyst09 Mar 7 '15 at 17:39
0
\$\begingroup\$

I have never tried it on my own, but from the looks of it if one Raspberry PI drain 2A then 3 should drain 6A at max, using rough estimation the maximum power needed would be: P = V * I , which is P = 5V * 6A = 30W. Yet the source you use is P = 9V * 1A = 9W. Roughly it's not safe enough in my opinion, unless you could at least get yourself a 12V - 3A power supply, which in my guess won't be that rare

well, I hope it helps, Cheers

\$\endgroup\$
  • \$\begingroup\$ If the PI needs a 5V source, a 9V source will not work. Matching the voltage needs to come before figuring out the power. \$\endgroup\$ – Greg d'Eon Mar 7 '15 at 16:17
  • \$\begingroup\$ @Kynit: The OP has already put buck converters into the scenario, so your comment is irrelevant. \$\endgroup\$ – Dave Tweed Mar 7 '15 at 17:06

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.