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Yes, you need to be reasonably close to the 5v spec and supply at least 500 milliamps (directly via USB), or ~12w via the iPad charger but that will give losses on the DC-AC-DC conversion. There is a protocol to inform the iPad over USB that it can draw more than 500ma, but in practice it isn't required. Only the iPad 3 is insufferably slow to charge that ...


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this is all related to the new upgrade of IOS7, the charger and cable are still good but Apple is trying to stick us into their products... you can still charge your device by rebooting it while charging :)


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Voltage does matter, it must be =<5V. You can use a simple voltage regulator to keep yourself from going over. You can also wire the panels so that they don't go over 5 (if each panel does 1.5V, 3 panels get you 4.5V, which will work but be slower. So the 4 panels will give 6 Volt and the 5 Volt Zener diode will cut off the access 1 volt Wattage is ...


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Because USB is a standard of 5V at 100mA increments, the charge should work without any problem. Some chargers sadly prevent themselves from working unless you use their device with their charger. You are much more likely to find a charger decides not to work with your phone than the charger will break your phone.


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It used to happen to me on my iPhone 4S. either force reboot your iPhone, pressing home button and power button for a few seconds, or switch it off for a few mins and then start it again. It fixes the issue. I am not really sure what causes it, i guess it sometimes does it on extended use of phone.


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With iPhone 5+'s lightning port (I know this isn't for that model but still could be an overlap), my problem turned out to be that lint was inside of my iphone's charger port and was blocking one of the pins from making a connection. Cleaned that out and the problem was solved


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I have the same issue AND bought the dc charger from Mac store. It worked fine until I did last software update. Not it only recognizes it sporadically



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