0

I am using a raspberry pi 3 model B (5V/2A), a sainsmart 7" lcd display (12V/2.5A), and a ESP8266 2.4Ghz transceiver (3.3V) for a project. It needs to be mobile, so what kind of power supply components would I need to run it from batteries?

4

You need one 12V battery with enough amp-hours to give you a viable lifespan, one 5V UBEC and one 3.3V regulator (with a couple of capacitors on its input and output for stability).

  • Connect the battery to the display, the UBEC and the regulator.
  • Connect the UBEC to the Pi.
  • Connect the regulator to the ESP8266.
  • 1
    just a quick note the 12V battery needs to have enough amp hours for the intended runtime so something like an A23 will not work. – Steve Robillard Feb 10 '17 at 1:00
  • 3
    The numbers have been run a few times here already (e.g. raspberrypi.stackexchange.com/a/41430/19949). In this particular case of course the other loads have to be taken into consideration too. 30 W for the display is quite a big deal. – Ghanima Feb 10 '17 at 1:07
  • @SteveRobillard You might get just long enough out of an A23 to see some LEDs flicker hopefully before they're cruelly snatched from your grasp. I was thinking something a little beefier maybe? – goobering Feb 10 '17 at 1:22
  • As was I, but the end user may not know what we do. I would likely go for one of those emergency car starter battery packs. When I first saw the portable requirement I was going to ask for a definition of portable. – Steve Robillard Feb 10 '17 at 1:23

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.