"bob haller" wrote in message

...all wall wart devices could be designed to accept a standard
voltage.,....... same for a cell phone charger standard to cut down on
trash


That is another interesting idea!

Many "wall warts" provide DC to all these electronic gizmos. So perhaps
connect these to the DC system - do away with the "wall warts".

So the central battery would provide battery backup AND DC power to
electronic gizmos (instead of using wall warts).

This could help to solve another problem which is voltage surges. The "whole
house" DC electronic power supply in the home could be well protected from
voltage surges, thus you don't need surge protectors at every outlet where
an electronic device is plugged in.

Also these electronic gizmos would continue to work during power outages.

As to voltage drop, make the main supply 24 volts DC if necessary. That
should give you over 12 volts DC at the end of the line.