Charging iPad3 with 7w charger - is it possible?

Discussion in 'iPad 3 Forum' started by snowman1235, Aug 6, 2012.

  1. snowman1235

    snowman1235
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    Hi,
    I'm setting up a new installation in house and would like to have a wall-mounted iPad3 for controlling the smart house installation. They have a very nice USB charger socket in the same design as all the switcher and sockets... However the current that comes out is only 7w and i'm worried it might not be enough for charging the ipad. Any experience with this? I would really like to have this usb socket as it keeps then the same design of all other switches in the house but would like to make sure it will work as it is quite expensive...

    Many thanks in advance to anyone who can help me with this! :)

    Cheers!
     
  2. leelai

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    Hi and welcome to the Forum!

    Not sure about your question but have a look at this thread. Hope it helps you.
    http://www.ipadforums.net/ipad-3-forum/78841-12-28v-charging-ipad3.html

    The IPad Forum is a community of members from all walks of life and from all over the world coming together to share our experiences and to help each other learn about this wonderful piece of technology the Ipad. There is a wealth of information already here in the many threads we have so doing some searches will answer most of the questions you have. If then you cannot find the answer you are seeking then by all means post your question. There are many friendly and informed members here only too willing to help you.

    We also have our own App - It is a very simple app to navigate.
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  3. snowman1235

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    Thanks for reply. ...If I read this properly (and another thread I found on a similar topic about charging by USB directly from laptop) it seems that it would charge, however much slower and possibly not to a full battery?

    This would be acceptable, as it will be plugged in most of the time, but it must be charging at least. What are maybe people's experiences with third-party chargers, that are perhaps not 10W but maybe less (like my potential wall charger is 7W)?
     
  4. AQ_OC

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    When I had an iPad 2 I found several chargers on Amazon that claimed to be 10W but were really 5W chargers. They charged the iPad but there were slow, but they could still be used. More importantly, not all 5W chargers would work on the ipad, but those I got of Amazon did. With the iPad 3, which has a much larger battery, using those would drive me nuts because it would take even longer to reach a full charge. So, using a 7W charger is not optimal, but if it s 5V at 1.4A (at least), then it might work, but it also might not. You need to try it before you finalize your build. No one here can know if that charger will really work at all to charge your iPad 3.

    So, some 5W chargers charge the iPad 2, but do it slowly. They would take even longer for the iPad 3.

    Also, some 5W chargers simply won't work on either iPad, so you need to proceed with caution. Test, test, test. You can't just ask questions. Take it there, hook it up, and see if it charges.
     
  5. janner43

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    I've been wondering why ipad chargers are identified as 10w when I have always been taught (by IT managers, mainly) to check the voltage & amperage of any charging device before using.

    My understanding has always been this.

    # The new ipad requires "10w" - which should mean any USB socketed charger outputting 5v & 2amps should be fine
    # The issue here is not amperage as the ipad will charge slowly from a PC USB port - 5v & .5amps (2.5w). The thing to be careful of is voltage.
    # Amps are "drawn" so if the maximum the ipad circuitry requires is 2.1amps, then even a 5v & 4amp charger won't be a problem as the iPad will only draw 2.1a
    # Voltage higher than 5v will likely damage your ipad so if the charger you are thinking of is 5v & 1.4amps, ie 7w, it won't damage your ipad but it may not charge it either. There is a possibility that the ipad attempting to draw a higher current than the charger is capable of delivering may damage the charger, but not the other way around.

    Hope that is clear & helps :)
     
  6. AQ_OC

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    Voltage is an issue but most USB chargers (not talking about a PC port) do use 5V. However, some of them don't have the correct leads connected on the plug to enable the iPad to charge, even when it provides 5V and 1A of current (5W charger).
     
  7. janner43

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    I understand what you are saying, but how can it be the case that the iPad cable will charge from a standard USB 2.0 pc/mac port if it (the cable)is not wired correctly as per USB 2.0 standards? Surely if a charger has a USB 2.0 compliant socket, the iPad will charge.
     
  8. AQ_OC

    AQ_OC
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    I have seen it in action. Some USB 5V/5W chargers won't charge the iPad and others will. Not all of the lines are needed for a charger because no data will be moved over the connection, but one still must use a USB plug. Physically, a plug is just a plug, but electrically it is different because not all of the connections are used. I believe the iPad, and other devices, like the kindle, look for certain electrical characteristics on the line before they allow charging. It is not just a matter of current and voltage.
     
    #8 AQ_OC, Aug 8, 2012
    Last edited: Aug 8, 2012
  9. janner43

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    Again, I do understand & I don't wish to appear argumentative :), but are we sure that this is due to the cable connections rather than poor chargers?
     
  10. AQ_OC

    AQ_OC
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    I don't think it has anything to do with the charger being poor, just what it was designed for. The cable connections only work how they work, but if a charger wasn't designed to charge an iPad they one is left the the option of finding one that will.

    One perfect example is the charger that comes with the google nexus 7. It is a 10W charger rated at 5V @ 2A but it won't charge my iPad. But my iPad charger will charge it!
     
    #10 AQ_OC, Aug 8, 2012
    Last edited: Aug 8, 2012

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