Looking for an AC to DC power converter for USB car chargers

Discussion in 'iPhone Accessories' started by Zmanbaseball2, Jan 30, 2014.

  1. Zmanbaseball2 macrumors 68040

    Zmanbaseball2

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    Location:
    New York, USA
    #1
    I am looking for an AC to DC power converter that allows me to plug my car chargers in my house. It must support 9.6 amps/40 watts of power so it can support these:
    Aleratec Quad 4 Port USB 9.6a (2.4 amps x 4) Rapid Car Charger for iPhone, Smartphones, iPad and Tablets
    http://amzn.com/B00EP3IWG2
    [NEW RELEASE] Saicoo 8A/40W 4 USB High output Ports Car Charger(83CM Cable Length), with separated ON/OFF Switch /LED indicator and one Silicone Paste and Velcro, Charger for iPhone 5S, 5C, 5, 4S, 4; iPads and iPods; Samsung Galaxy S4, S3, S2, Galaxy Note 2; Motorola Droid RAZR MAXX; HTC One X V S and more - White
    http://amzn.com/B00GANTT94
    I live in thE USA so it has to be USA power prongs. It also must be on amazon.
    I hope someone can help me.
    Thanks!
     
  2. andyw715 macrumors 6502a

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    Oct 25, 2013
  3. T5BRICK macrumors 604

    T5BRICK

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    #4
    Both of the chargers that the OP posted have 12-24v listed as their input voltage. I don't think they'll operate correctly at 5v.
     
  4. Zmanbaseball2 thread starter macrumors 68040

    Zmanbaseball2

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    #5
    Looking for an AC to DC power converter for USB car chargers


    I've been looking at that one. I don't know everything about how power works but the title said 6 Amps. Where does 14.4 come from. Little confused.


    To the thread:
    Also trying I keep a 30$ budget.
     
  5. T5BRICK macrumors 604

    T5BRICK

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    #6
    current x voltage = wattage

    6 amps x 12 volts = 72 watts

    ? amps x 5 volts = 72 watts < you can do the math on this one, but a cheap power supply isn't going to work this way.

    A decent 10 amp power supply ain't gonna be cheap...
     
  6. Zmanbaseball2 thread starter macrumors 68040

    Zmanbaseball2

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    #7

    This one will work with the car chargers I said?
    Schumacher PC-6 120AC to 6A 12V DC Power Converter
    http://amzn.com/B0012BL8LG
     
  7. T5BRICK macrumors 604

    T5BRICK

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    #8
    Neither of the chargers you listed show their maximum input current, just the voltage. I'd have to guess that it would PROBABLY work, but I don't know for sure. The one I posted earlier would work for sure, as it has the same output rating as most cigarette lighters and power points.
     
  8. ElectronGuru macrumors 65816

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    #9
    Why not cut out the middle man?:

    PowerGen White 4.2-Amp (20 Watt) Dual USB Wall Charger Designed for Apple iPad & iPhone
    http://amzn.com/B00BNQTIRQ

    Search for "USB amp" brings up a ton
     
  9. Zmanbaseball2 thread starter macrumors 68040

    Zmanbaseball2

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    Location:
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    #10
    Looking for an AC to DC power converter for USB car chargers


    I need an ac to dc for reviewing car chargers. I review many car chargers on amazon and it is winter and too cold to go test it in the car and is more roomy to plug in in a house.

    ----------

    [​IMG]
     
  10. andyw715 macrumors 6502a

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    Oct 25, 2013
    #11
    Basically there are 2 conversions going on.

    110ac to 12v dc (6A) - linked amazon item
    then the car chargers
    12v dc to 5vdc (usb) - with variable current draw ~8A each charger @ 5vdc

    The draw on the chargers from the devices is 5v (USB charging.)
    The converter I linked is 6A @ 12V (output)
    6*12 = 72W

    The first one listed is 2.4A x 4 ports @5v
    so 2.4*4*5 = 48W

    The second on listed is 8A (4 ports combined) @5V
    so 8*5 = 40W


    It won't be able to handle both chargers at full capacity though.
    48W+40W = 84W

    But I didn't see that requirement in the OP
     
  11. ElectronGuru macrumors 65816

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    #12
    Yours is the second reference I've seen in a month to 'professional amazon reviewer'. Silly me, I've been doing it for free!
     
  12. T5BRICK macrumors 604

    T5BRICK

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    #13
    I can guarantee that the devices aren't 100% efficient though. The big unknown is the current draw of the two chargers themselves, but they don't list that information.
     
  13. Zmanbaseball2 thread starter macrumors 68040

    Zmanbaseball2

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    #14

    You looking for the input of the car chargers?
     
  14. T5BRICK macrumors 604

    T5BRICK

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    #15
    Yes. Normally a device will list the input voltage and current as well as the output voltage and current. These don't list the input current, but they do list everything else.
     
  15. andyw715 macrumors 6502a

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    #16
    Yeah I'm sure the chargers themselves draw (vampire) power.
    But I would think that would be negligible in this case.

    i.e. both can provide 8-9A at 5V to the devices.
    so 40-50W.

    To the converter that is 4A @ 12V
    The converter can provide 6A
    I doubt the charger has a 1-2A vampire draw (vampire draw is power used by the charger when its "idle")

    There is plenty to spare.
     
  16. Zmanbaseball2 thread starter macrumors 68040

    Zmanbaseball2

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  17. andyw715 macrumors 6502a

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    #18
    They probably don't cause at idle (non charging) its minimal current draw (i.e. light up a LED or something).
     
  18. T5BRICK macrumors 604

    T5BRICK

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    #19
    I have a 120vac, 8w to 24v dc, 4w adapter at my workstation right now. This unit obviously isn't the most efficient piece of equipment ever(it loses 50% of the input power in the conversion from AC to DC), but keep in mind that converting from AC to DC is typically more efficient than converting from DC to AC.
     

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