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SavannahLion:

--- Quote from: Ed_McCarron on November 24, 2009, 08:20:34 am ---
--- Quote from: SavannahLion on November 24, 2009, 03:23:49 am ---I was going to try using a C13/C14 combination (ie your bone standard PC power cord) but since I'm trying to feed multiple sources from this supply, a PC cord would be unsuitable. In theory, I think I can easily overload the 10amp limit of the PC cable trying to feed a PC, light, monitor, etc.

--- End quote ---

10A at what, 120v?
--- End quote ---

Yes. Though those Home Depot and Rat Shack jack asses keep insisting my house is 100V. The pop shop agrees with my meter, but then they told me I couldn't build my Gorf adapter. So I can't win either way.


--- Quote ---  No clue where you are or what line voltage is - is 1200-ish watts.  Figure a few hundred for the PC, about the same for a monitor, and whatever the light is rated.  You hit 6-7A and it'd be impressive.

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Oh thank god, I was going ape ---steaming pile of meadow muffin--- crazy trying to figure why my numbers seemed all skewed. I was using Ohms law and using formulas like like this which came out with numbers both you and Protokatie are pointing out.

OK, so to prevent my brain from slipping again. Why does Random PSU have a total output of a mere 850W but show an input current of 12A? Is there something I'm not understanding about that? Is the power supply really only (counts off fingers) about 60% efficient? If I assume I find a way to load the PSU up to 850W (I know that's not possible, but for the sake of argument let's say I did) would I really blow off that much waste energy?

I'm actually embarrassed at this point.  :banghead: I feel so  :lame:

Ed_McCarron:

--- Quote from: SavannahLion on November 24, 2009, 08:46:59 am ---OK, so to prevent my brain from slipping again. Why does Random PSU have a total output of a mere 850W but show an input current of 12A? Is there something I'm not understanding about that? Is the power supply really only (counts off fingers) about 60% efficient? If I assume I find a way to load the PSU up to 850W (I know that's not possible, but for the sake of argument let's say I did) would I really blow off that much waste energy?

--- End quote ---

12A @ 120v = 1440W, if it were 100% efficient (in that perfect world we hear about in physics exams...)  But, yes, if it says that its a 850w power supply then 590W are being wasted at 100% load.  69% seems about right, mathwise.  Reality?  Probably not.

I suspect the 12A label is inrush current and nowhere near what it runs at.

SavannahLion:
Jesus, I thought efficiency went up.

Oh well... thanks for the clarification. I'm reverting back to my original two ideas for powering the cab.

Now I have to figure out where to put the speakers I forgot to incorporate.  :banghead: Maybe I can just punch a hole in the front and add a chrome jobbie.

Darn it.

Ed_McCarron:

--- Quote from: SavannahLion on November 25, 2009, 01:08:25 am ---Jesus, I thought efficiency went up.

--- End quote ---

Not if you want price to keep going down. :)

SavannahLion:

--- Quote from: Ed_McCarron on November 25, 2009, 03:22:14 pm ---
--- Quote from: SavannahLion on November 25, 2009, 01:08:25 am ---Jesus, I thought efficiency went up.

--- End quote ---

Not if you want price to keep going down. :)

--- End quote ---

Interesting trend. Environmentalists are a funny bunch.  :laugh2:

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