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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?

ruffestwood
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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.
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goobering
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    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 01:00
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    The numbers have been run a few times here already (e.g. http://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 01:07
  • @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](https://www.cclcomponents.com/rolls-12v-503ah-c100-flooded-deep-cycle-battery) maybe? – goobering Feb 10 '17 at 01:22
  • 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 01:23