Hello there,
I’m using a power bank with:
capacity of 5200 mAh
input 5V // 2.1A
output 5V // 2.1A
(Cellularline FASTCHARGE)
With it I’m powering the Raspberry PI3, the Pisound (mounted on the PI), a 5 inch touch screen display (connected to the PI by a USB cable and the HDMI cable), a little bluetooth keyboard (Rii mini X1)
I’m feeding Pure Data (driven by the PI) with live trumpet sounds, synth sounds and MIDI messages.
I’ve been playing around with this system for around 3 hours consecutively and experiencing no problems at all.
As Giedrius advised me, it’s important to power up the system with a steady 5V // 2A.
In my case (with my connections) different amperage would mess up the system (I’ve tried and I’ve burned one PI’s SD card…)
Best wishes,
Giorgio