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View Diary: Something to watch with LED lighting (233 comments)

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  •  Except take a look at your collection (6+ / 0-)

    of wall warts. If you have 2 that are the same voltage (not all are even DC) I'd be surprised. Converting one DC voltage level to a different DC voltage level isn't as simple as for AC, where all you need is a transformer (that's why AC dominates in the first place).

    Also, wiring size is determined by current, not voltage, and the lower DC voltages lead to higher currents. Look at the battery cables on your car for example. They're about the same size as your range, but the range can draw upwards of 5000 watts, while the starter on your car (the biggest power draw) probably doesn't reach over 500W.

    Personally, I'd wait to wire low voltage DC until I needed it, since the code requirements for that kind of wiring are much simpler and cheaper than 120/240 volt AC, and you can hide the wiring more easily than behind the sheetrock like AC wiring is done.

    No matter how cynical you become, it's never enough to keep up - Lily Tomlin

    by badger on Tue Jan 14, 2014 at 05:47:58 PM PST

    [ Parent ]

    •  I'm not thinking right away... (2+ / 0-)
      Recommended by:
      Calamity Jean, kyril

      ...more of where we'll end up.  I think we'll be needing 120v AC for major appliances, but we may end up powering our lighting and small appliances from a centrally located low voltage DC supply. And once we decide that the standard will be, for instance, 24vdc with such and such a connector, then all your USB hubs, cel phone chargers and what not will be happy to dispense with the wall warts.

      •  When this does happen (3+ / 0-)
        Recommended by:
        badger, Bill W, Judgment at Nuremberg

        I think the resulting connector/wiring is more likely to be a descendant of USB than a simple DC plug. Most of the small electronics that would benefit from DC wiring would benefit even more if they could share data over the same network from which they draw power.

        There's already been some progress in creating a USB Power Delivery standard. The current maximum is 100W at 20V on a standard connector and 60W at 20V on a micro connector.

        I don't think anyone's ready to start wiring buildings yet, but that's the technology I'd be looking at if I really wanted to get ahead of the curve.

        "Let’s just move on, treat everybody with firmness, fairness, dignity, compassion and respect. Let’s be Marines." - Sgt. Maj Michael Barrett on DADT repeal

        by kyril on Wed Jan 15, 2014 at 07:39:37 AM PST

        [ Parent ]

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