Powering an 800XL / 65XE via SIO

Hi all,

I want to power my Atari computer via the SIO port. 

I see in the schematics that the 5V input of the atari splits into several 5V lines named 5A, 5B, 5C and 5D, they seem to differ only in some inductors and capacitors. 

I think that pin 10 of the SIO feeds via an inductor to one of these, the 5A line.

Is it possible to power the entire system through the SIO? I am aware that the Atari can consume up to 1.5A, reason why I'm not 100% sure if this would work since the SIO gauge may not appropriate.