1. Due to the recent site upgrade, the iPadForums (iPF) App will no longer work. The new iPadForums.net website has been designed from the ground up to work perfectly from any mobile, tablet, or desktop computer using the built in internet browser. Create a shortcut to iPadForums.net on your home screen by following these steps: Create an icon for iPadForums.net

Charging iPad3 with 7w charger - is it possible?

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

  1. snowman1235
    Offline

    snowman1235 iPF Noob

    Joined:
    Aug 6, 2012
    Messages:
    3
    Thanks Received:
    0
    Trophy Points:
    0
    Ratings:
    +0 / 0
    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
    Offline

    leelai Administrator Staff Member

    Joined:
    Apr 24, 2011
    Messages:
    24,808
    Thanks Received:
    1,263
    Trophy Points:
    113
    Location:
    Brisbane, Australia
    Ratings:
    +1,325 / 0
    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.
    http://itunes.apple.com/us/app/discussion-forum-for-ipad/id412896524?mt=8
    Reading the IPad manual is a great place to start so please download a copy of these.
    http://www.support.apple.com/manuals/ipad/
    3 very informative threads from which you will learn many tips and shortcuts for the IPad.
    http://www.ipadforums.net/ipad-general-discussions/21590-tips-tricks-those-us-who-dont-know.html
    http://www.ipadforums.net/ipad-os/49581-ios5-tips-tricks.html
    http://www.ipadforums.net/ipad-help...shortcuts-helpful-places-people-new-ipad.html
    We have rules like any Community so please read these also
    http://www.ipadforums.net/forum-rul...um-rules-everybody-please-read.html#post14697

    Once again we welcome you here and are so pleased you have joined us!

    iPad 2 3G 64gb
  3. snowman1235
    Offline

    snowman1235 iPF Noob

    Joined:
    Aug 6, 2012
    Messages:
    3
    Thanks Received:
    0
    Trophy Points:
    0
    Ratings:
    +0 / 0
    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
    Online

    AQ_OC Super Moderator Staff Member

    Joined:
    Apr 28, 2011
    Messages:
    6,418
    Thanks Received:
    430
    Trophy Points:
    83
    Location:
    SC
    Ratings:
    +430 / 0
    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.
    • Like Like x 1
  5. janner43
    Offline

    janner43 iPad Fan

    Joined:
    Jun 25, 2012
    Messages:
    152
    Thanks Received:
    12
    Trophy Points:
    18
    Location:
    Devon, UK
    Ratings:
    +12 / 0
    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
    Online

    AQ_OC Super Moderator Staff Member

    Joined:
    Apr 28, 2011
    Messages:
    6,418
    Thanks Received:
    430
    Trophy Points:
    83
    Location:
    SC
    Ratings:
    +430 / 0
    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
    Offline

    janner43 iPad Fan

    Joined:
    Jun 25, 2012
    Messages:
    152
    Thanks Received:
    12
    Trophy Points:
    18
    Location:
    Devon, UK
    Ratings:
    +12 / 0
    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
    Online

    AQ_OC Super Moderator Staff Member

    Joined:
    Apr 28, 2011
    Messages:
    6,418
    Thanks Received:
    430
    Trophy Points:
    83
    Location:
    SC
    Ratings:
    +430 / 0
    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.
    Last edited: Aug 8, 2012
  9. janner43
    Offline

    janner43 iPad Fan

    Joined:
    Jun 25, 2012
    Messages:
    152
    Thanks Received:
    12
    Trophy Points:
    18
    Location:
    Devon, UK
    Ratings:
    +12 / 0
    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
    Online

    AQ_OC Super Moderator Staff Member

    Joined:
    Apr 28, 2011
    Messages:
    6,418
    Thanks Received:
    430
    Trophy Points:
    83
    Location:
    SC
    Ratings:
    +430 / 0
    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!
    Last edited: Aug 8, 2012
  11. janner43
    Offline

    janner43 iPad Fan

    Joined:
    Jun 25, 2012
    Messages:
    152
    Thanks Received:
    12
    Trophy Points:
    18
    Location:
    Devon, UK
    Ratings:
    +12 / 0
  12. janner43
    Offline

    janner43 iPad Fan

    Joined:
    Jun 25, 2012
    Messages:
    152
    Thanks Received:
    12
    Trophy Points:
    18
    Location:
    Devon, UK
    Ratings:
    +12 / 0
    I think it turns out that neither of us was completely correct :)

    Here... How USB charging works, or how to avoid blowing up your smartphone | ExtremeTech - in a comment, is the following...

    This now makes sense of what I read here, when it says - Apple iPod, iPad and iPhone dock - AllPinouts

    So, my conclusion is that the ipad will only charge from a charger that has the data pins (2&3) connected within the charger to the correct resistors. After that the charger needs to be 5v / 2amp. Or to put it succinctly, the charger must say that it will charge iDevices. The voltage & amperage can be checked with a multi meter after that to confirm whether they are outputting 1a (5w) or 2a (10w)

    :)
    Last edited: Aug 8, 2012
  13. janner43
    Offline

    janner43 iPad Fan

    Joined:
    Jun 25, 2012
    Messages:
    152
    Thanks Received:
    12
    Trophy Points:
    18
    Location:
    Devon, UK
    Ratings:
    +12 / 0
    Can you say that here :)

    I have an Asus Transformer tf101 but am seriously (like 99%) considering changing to the new iPad. We have a 7" Android tablet for my wife, but I'm thinking that having both types in the family will be the best of both worlds :)

    How do you rate the Nexus? And how much difference is there between the two OSs & apps in your opinion?
  14. AQ_OC
    Online

    AQ_OC Super Moderator Staff Member

    Joined:
    Apr 28, 2011
    Messages:
    6,418
    Thanks Received:
    430
    Trophy Points:
    83
    Location:
    SC
    Ratings:
    +430 / 0
    These connections are what I mean when I was speaking of the electrical characteristics. Those connections are not evident externally at the plug level and you cannot seem them by inspection of the charger or the cable. Yet, you use a usb compatible charger (USB plug, 5V). The iPad is looking for certain characteristics and if it doesn' find them it won't charge. It has nothing to do with the charger being poor, it has to do with what the designer intended.

    You're going to have a hard time measuring amperes on these chargers and cables. The simple way to measure is to use a Kill A Watt meter and plug your charger into it. It will tell you the wattage being drawn by the charger. During the full charge mode, it will clearly show 10W for an iPad, though this will drop as the device nears a complete charge.

    The iPad can be charged by some chargers that output 5V @ 1A or even less. But the charging will be slower. When you buy a charger, you need to ensure 5V @ 2A if you want the full rate of charging and it does need to state that it is designed for iPad. Lots of chargers are sold for iDevices that only output 5V @ 1A (I have tested these with a Kill A Watt meter and they only deliver 5W). This issue is widespread and many have had problems with it.
  15. AQ_OC
    Online

    AQ_OC Super Moderator Staff Member

    Joined:
    Apr 28, 2011
    Messages:
    6,418
    Thanks Received:
    430
    Trophy Points:
    83
    Location:
    SC
    Ratings:
    +430 / 0
    I have 3 Android tablets. I like the Google Nexus 7 a lot. It is light, has a nice screen, and has Jelly Bean. I find the apple system greatly superior, overall, but the Androids are improving. Both tabs OS are easy to work with, though I'd say Android requires more fiddling, but it is much more configurable. IMO, Android 4.1 (Jelly Bean) is much better than ICS Android 4.0. The Google Nexus is a sweet little machine. Apple will have to respond to it or it will lose the 7-inch market to Google. I find the tablets apps are simply better on iOS as are the accessories. But Android does give you much greater flexibility. You can connect a usb hard drive, keyboard, or ps2 controller to it, for example.
  16. coolstuffs
    Offline

    coolstuffs iPF Novice

    Joined:
    Jun 1, 2012
    Messages:
    87
    Thanks Received:
    2
    Trophy Points:
    0
    Location:
    NY
    Ratings:
    +2 / 0
    The 7W charger will charge your Ipad but it will take much longer compared to the 10W charger. How long? you can refer to this link in determining the capacity rating of the Ipad battery. Just divide the capacity rating by number of current in milli-amperes provided by your 7 W charger and it should result to an approximate time needed to attain full charge condition. 1000 milli-ampere = 1 ampere.

    One thing to take note also is to avoid overloading your charger by not operating your ipad while being charge by the 7W charger.
  17. janner43
    Offline

    janner43 iPad Fan

    Joined:
    Jun 25, 2012
    Messages:
    152
    Thanks Received:
    12
    Trophy Points:
    18
    Location:
    Devon, UK
    Ratings:
    +12 / 0
    Thanks for that :)

    I believe you have confirmed what I was thinking, in that Apple hardware & iOS is of a better, more reliable & robust quality & that the Apps are superior.

    Android has done well in a short period, but hasn't developed as reliably as many had hoped given its more open nature. While my tf101 has been great (apart from the first few iterations of ICS) the newer Asus tablets such as the tf700 Infinity are very expensive for what they are, within $75 of an Ultrabook. In the UK the new iPad 16gb is available for $300 less than I would have to pay for the only configuration of the tf700 available (64gb with dock)

    As my one tech purchase these days, having gone fully "post PC" I like to update annually (for my birthday), but £399 is pretty much the limit I am prepared to pay, so it looks like a new Ipad will be on its way to me in a few short weeks :)
  18. snowman1235
    Offline

    snowman1235 iPF Noob

    Joined:
    Aug 6, 2012
    Messages:
    3
    Thanks Received:
    0
    Trophy Points:
    0
    Ratings:
    +0 / 0
    Thanks coolstuffs! That is exactly the kind of answer I was hoping for! :)

    ...Although I intended to use it also while plugged-in (it will be wall mounted), that is only to access the interface of the "smart house" installation. Otherwise, if I wanted to do anything process intensive, I would probably take it out of the wall-mount and use it unplugged.

    Many thanks!
  19. coolstuffs
    Offline

    coolstuffs iPF Novice

    Joined:
    Jun 1, 2012
    Messages:
    87
    Thanks Received:
    2
    Trophy Points:
    0
    Location:
    NY
    Ratings:
    +2 / 0
    You're most welcome. We're all here to help each other.
  20. janner43
    Offline

    janner43 iPad Fan

    Joined:
    Jun 25, 2012
    Messages:
    152
    Thanks Received:
    12
    Trophy Points:
    18
    Location:
    Devon, UK
    Ratings:
    +12 / 0
    Given my posts above about the pinouts & specific requirements that a charger for the iPad needs to have, while it was the answer you wanted, it may or may not be correct. :)

    Firstly if the charger just shorts out the data pins - a fairly common practise, it most certainly will not work.

    Secondly it is probable that by overloading your charger by connecting it to a device (iPad) which requires a greater current draw than that which the charger is specified for & can handle, that you may not only shorten the life of the charger, but by leaving it permanently connected you will certainly shorten the battery life of your iPad while possibly creating a fire risk due to the potential of the charger to overheat.

Share This Page

Search tags for this page
apple ipad 3 pinouts
,
apple ipad3 pinout
,
how does msi use usb data pins for power in super charger
,
how many pin charger is the ipad3
,
how many pins does ipad charger have
,
how many pins for ipad 2 charger
,
how many pins in charger for ipad 3
,

ipad 3 charger specs

,
ipad 3 factory charger specs
,
ipad charger current characteristics
,
ipad3 pinout
,
many pins does ipad 3 charger require
,
max ipad 3 charge voltagr
,
tablet infinity 2a charger
,
usb ipad3 apple pinout
,

why do ipad chargers come apart

,
why do my ipad chargers only last a little whiles pad chargers die after only a few weeks use
,
will an 7w charger charge a ipad