DC Mains Electricity
Basic Concept
As it stands right now there is little to no widespread usage of DC loops in a home, most instead rely on inverters from a battery bank or dc power source to an AC wall outlet. Even worse some then plug in inverters to charge their devices batteries. This is a very inefficient system. In order to increase electric efficiency, as well as convenience, we should develop/popularize a standard for DC power at a mains electricity level. This isn't intended as a replacement for AC power, but a complement, and efficiency booster.
Current Standards
1. "Cigarette Lighter/Barrel" style socket: -typically 12V -large and cumbersome
2. "USB type A female gen 1 or 2" -typically 3 A 5 V 15 W maximum voltage -much smaller than barrel socket -becoming more universal, but has many different forms requiring many different cables
3. "USB type C" -typically 5 A 20 V 100 W maximum volage -similar size to "USB type A female gen 1 or 2" -very universal;only one form and cable is identical on both sides. -can also be thunderbolt 3 which has more power transmission capabilities
4. Power Over Ethernet (POE)
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Useful Links:
1. https://hackaday.com/2016/12/21/so-wheres-my-low-voltage-dc-wall-socket/