raspberry pi --> power consumption + battery design

My suggestion of a Chinese buck-mode converter is instead of the 7805. Other circuitry would be required no matter what. Ready made boards to run a Pi from a "car battery" most likely are available off-the-shelf.

And substitute an RPI3, with a 16G card from the same series.

The RPI3 is about the same. It runs at 0.09A when off/idle, and starts at 0.21A when loading linux (or what it does before it types anything to the screen). It then goes to 0.31A during the rest of the boot. Then it quiests down to 0.25A.

This one lifts a lot more, especially with all the 4 processors busy. Peak at 0.41A, quite steady at 0.39A>

The RPI3 is slightly higher in consumption.

Done that. Now to measure the odroids and the bananapis.

-- mrr