You can do this relatively cheaply employing a battery box suitable for aa batteries and a universal battery eliminator circuit.
Raspberry pi rack power supply.
Plug each pi into one of the power supply s jacks ensuring all pis are plugged into a 2a port skip this step if using a poe switch and poe hats.
It ll keep feeding your pi the steady 2 5a it needs for proper performance.
All models require a 5 1v supply but the current supplied generally increases according to model.
Rack the raspberry pis.
Mount the stack to a board and mount the network switch and usb power supply as well.
In keeping with the nature of the raspberry pi you might opt to build your own portable power supply.
We ve tested this supply in all kinds of situations and it s as solid as a rock.
All models up to the raspberry pi 3 require a microusb power connector whilst the raspberry pi 4 uses a usb c connector.
Mount one pi per tier of the stackable case.
Interchangeable heads for different countries.
The official and recommended universal micro usb power supply for raspberry pi.
You ll need six or more aa batteries for this solution but it s.
Raspberry pi power supply soulbay 5v 3a micro usb ac adapter with 6feet long cord for raspberry pi 3 2 model b b pi a a zero android tablet compatible with dc5v 2 5a 2a 4 7 out of 5 stars 18 10 99 10 99 get it as soon as fri jul 24.
The power supply requirements differ by raspberry pi model.
