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I believe the biggest issue right now with internal DC wiring is you need much higher gauge wire, which translates to more expensive cabling throughout the hous

I believe the biggest issue right now with internal DC wiring is you need much higher gauge wire, which translates to more expensive cabling throughout the house. You also still need a way to step the voltage for each device, so it's not clear what the savings are. It may be beneficial for lights where a clear standard for voltage can be determined, but everything else will still have it's own requirements.

extrapickles 10y ago
You can use the same gauge wire if the voltage stays the same. The downside is that all of the switches and circuit breakers need to be replaced with ones rated for DC as arcs are harder to break. Most DC installations are <50v to take advantage of existing DC powered gear and circuits under ~50v don't need a licensed electrician to do the work (in most locations).