A while back (during construction of my new house), I wrote an article about the capabilities of the DSC 1832 alarm panel. Well, time got the better of us and I wasn’t able to wire the house myself. Instead, we had a third party alarm company provide “a la carte” wiring service. This included (all 22/4):
So there’s a reason (or several) why your house isn’t wired for DC electrical operation. But there are a variety of situations in which you may want to add DC capability to your house — for example, off grid situations or if you want a house-wide 12V UPS backup.