we have experimented with different power supplies for use with the Raspberry Pi 3B (plus and normal). Most of them exceed the power needed by the Raspberry Pi, i.e. 5V and 3A for example, or 5v and 2.5A, but many result in a warning in the “Device” page of Info beamer telling us that the power is not enough.
Have you got any suggestion as to a verified power supply for Pi 3+? Should we stick with the “Official” one which is quite expensive? Could it be a problem of the cable, or maybe of overheating since the Raspberry is inside an enclosed metal case?