Question for engineer / mathy types that can do the conversion loss calculations:
- A lot of things geeks run have power bricks that output DC.
- Most of these run on similar voltages.
- Quite a lot of them have some "fudge" where they can actually run fine on quite a bit higher or sometimes lower voltage than what their included bricks put out.
- One big AC-DC converter in the basement that puts out a "good enough" voltage for most of your toys is (much?) more efficient than a myriad of little bricks strewn around the house
- DC power transmission losses are negligible in something the size of a single family dwelling.
Would there be anything substantive to gain by putting in a maybe 10-12v, multi-amp power supply in the basement and running it to the various places you plug things in? Big-ass USB power supply @5v would cover a lot of things, but more stuff like streaming TV players, maybe laptops, and the like might be able to run from a bit higher voltage.
Granted, the opportunities for shorts, magic blue smoke release, and general safety issues are probably way more problematic than what you'd save in power conversion, and you will still need 110v to run big motors, and the like, but...