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mains sockets with 2 USB ports delivering 2.1A to both ports (not shared) ?

Discussion in 'Electrics UK' started by sjws1888, 25 Feb 2016.

  1. sjws1888

    sjws1888

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    Hi
    I'm thinking of getting some mains sockets with built in USB ports, along the lines of these:

    http://www.screwfix.com/p/mk-13a-2-gang-double-pole-switched-socket-2-1a-usb-charger-white/3905g

    I haven't purchased any yet though as I can't find any that can deliver 2.1A from both usb ports at the same time (ie delivering a total of 4.2A). All of the ones I've found tend to be 2.1 to 2.4A shared across both ports - which is a bit useless really as I want to be able to plug 2 iphones into them at the same time.

    Does anyone know of any of these sockets that can deliver the full 2.1A to both USB ports?

    Cheers
     
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  3. Taylortwocities

    Taylortwocities

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    I do not know of one with more than 2A (ish) shared.

    As you only
    Then you do not have a problem as the iPhone only requires 1A to charge. It is only the iPAD that needs 2amps. So charging 2 iPhones on most twin USB sockets is fine.

    More info on charging currents here
    https://discussions.apple.com/docs/DOC-3511
     
  4. bernardgreen

    bernardgreen

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    Bear in mind that if ( when ) the USB power unit fails you may need to replace the socket before the RCD protecting the socket can be reset to ON.

    Also bear in mind that some equipment can only be charge from a charger approved by the equipment manufacturer. The equipment and the approved charger handshake some data before the equipment will alow the charge to charge it. If the socket USB cannot perform the handshake then the equipment will not charge.
     
  5. JohnW2

    JohnW2

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    I haven't seen any, either.

    As a related question, does anyone know of a dual (or more!) plug-in USB charger than can deliver more than ~2A total? When the family descends upon me en masse, I sometimes find myself with requests to simultaneously charge a number of phones and tablets, and although the latter are not usually iPads, they often claim to want ~2A each!

    Kind Regards, John
     
  6. JohnW2

    JohnW2

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    Whilst that might conceivable be true, I would strongly suspect that there will not be any earth connection to the 'USB module' - so that it is very unlikely that a 'failed' USB power supply would result in an RCD tripping. A failure in the PSU's input circuitry which caused an MCB to operate might be more likely (since, until the new Standard described by stillp comes into force, I don't think one can necessarily rely on these PSUs having internal over-current protection).

    Kind Regards, John
     
  7. SFK

    SFK

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  8. JohnW2

    JohnW2

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    Thanks! I obviously hadn't looked (this thread made me think of the need to !) - but, although I suppose I shouldn't have been surprised (given the proliferation of USB charging!), I didn't realise that there were so many out there!

    Kind Regards, John
     
  9. Taylortwocities

    Taylortwocities

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    @SFK. Yes there are. Some of them act as a reason for the fire brigade to make a visit too!

    But the OP specifically asked about
     
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  11. SFK

    SFK

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    TTC,
    My apologies to you and John - I did not mean to change the direction of the chat away from "mains sockets with built in USB ports", I was answering the question John asked where he said >>>> "As a related question, does anyone know of a dual (or more!) plug-in USB charger than can deliver more than ~2A total? When the family descends upon me en masse, I sometimes find myself with requests to simultaneously charge a number of phones and tablets, and although the latter are not usually iPads, they often claim to want ~2A each!" as I had seen these used in some companies where there have multiple tablets for presentations etc.
    regards sfk
     
  12. JohnW2

    JohnW2

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    Indeed, but you have no reason to apologise - it was me who asked that supplementary question (after the OP had got his answer to the original question)! If that also requires an apology, then please take this as one!

    Kind Regards, John
     
  13. ericmark

    ericmark

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    In the USB 1.0 and 2.0 specs, a standard downstream port is capable of delivering up to 500mA (0.5A); with USB 3.0, it moves up to 900mA (0.9A). The charging downstream and dedicated charging ports provide up to 1500mA (1.5A).

    Apple do not seem to have signed up to the standard so some apple items need their own charger all other USB other than silly apple will be fine with 2A shared between two sockets unless apple make a charging socket your unlikely to find one. It would be non standard.
     
  14. JohnW2

    JohnW2

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    I'm not sure that it is particularly Apple's fault. An iPad will charge from a USB 1.0 or 2.0 port, but extremely slowly - and a bit faster (but still pretty slow) from a USB 3.0 one. It is presumably because users want faster charging that Apple supply a 2A charger - a Standard cannot change physics!

    I imagine that the reason why the iPad needs more current to charge fairly quickly is that it is quite a big and heavily used device (as compared, say, with a phone) and, again, users want a battery in it big enough to allow a reason period of off-charge usage. Let's face it, an iPad is not that much different from a laptop, and if you tried charging a laptop with ~5W, you'd probably be waiting quite a long time.

    Kind Regards, John
     
  15. flameport

    flameport

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  16. canduit

    canduit

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    This may or may not be off topic but my Samsung tablet came with a 5.3 volt charger. I wondered why it took ages to charge via my Samsung phone charger...!
     
  17. Iggifer

    Iggifer

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    I presume you mean 5.3A not 5.3V?
     
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