charging Iphone 14 with 20w or 30w charger

Whether you use a 20w or 30w charger will make no difference as the phone regulates the charge. A more powerful charger will provide no benefit whatsoever. But it also won't hurt the phone either, so if you already have a 30w charger, use it. Just don't buy a 30w charger with the hope it will be better, because it won't be better.

I hope you don’t mind my questions!

I looked at my wall plug, and it says: Output 5 volts 2.1 amps. How can I determine the wattage of a wall plug if it doesn’t tell me?

Check your facts. 14’s can charge to 27w so yes a 30w will shorten your charge time.

iPhone 14 can take 27 watts so a 30 watt charger is better. I’ve tested it.

makes a significant impact during the first 20 or so mins but eventually tapers off at high % as the phone reduces to trickle charge and from zero to full there’s not a huge amount of difference between 20 and 30w chargers (but there is still some).

Actually, I just asked Electrician the same question a few weeks ago… His reply was something I hadn’t thought of since high school physics class, “ohms law“

Amps x Volts = Watts

so

2.1 amps x 5 volts = 10.5 watts

But you need a 20 watt adapter/wall plug to enable fast charging, am I right?

Anyways, that’s true for my iPhone 12. Strangely enough, I didn’t find anything referring to that in the technical specifications of the iPhone 14.

So, for example, my iPhone 12 draws 7.5 watts except when fast charging, then it draws 20 watts? When does fast charging enable?

Thank you!

Depending on the model of iPhone 14, the charge controller (U2 ic chip) can regulate up to 27W.

“A U2 ic chip is a small part of your iPhones’ board. This little guy is in charge (geddit?) of the power and battery usage of the iPhone and how your phone ‘understands’ when it’s plugged in and how much battery is left.” - Source

You need at least an 18w charger to support Fast Charging if you plug the phone in to charge. I don't know of anyone selling 18w chargers, so yes, you need a 20w charger if you want to fast charge an iPhone. Apple sells 20w chargers itself.

Here is a link about fast charging your iPhone from Apple. Just note that more watts than 20w, won't charge your phone any faster. The phone itself limits the charge coming in.

Fast charge your iPhone - Apple Support

You're welcome. Buy yourself a decent charger! I however, moved to MagSafe charging a couple years ago.

Papalouhere wrote:

Check your facts. 14’s can charge to 27w so yes a 30w will shorten your charge time.

LOL. NO, it won't. You can use a 100w charger and it won't charge any faster as the phone itself regulates the power coming in. Not the other way around.

Wireless charging does NOT decrease maximum capacity in ANY way.

H1290 wrote:

I hope you don’t mind my questions!

I looked at my wall plug, and it says: Output 5 volts 2.1 amps. How can I determine the wattage of a wall plug if it doesn’t tell me?

I don't mind your questions at all. I don't know how to tell you how to check the wattage of a wall plug, but I would hazard a guess that's not a 20w charger. All of the 20w chargers I own (I have several for different devices) say they are 20w. If I can recommend one that is reasonably priced and is exceptionally well made, it's the Anker Nano 20w charging plug. Amazon sells then for about $16, so does BestBuy.

Thank you. I believe you over that other guy…

BTW, thanks for writing the “SAD reality of buying used iPhones” User Tip. It’s very handy!

Ummm, I found a professional looking adapter at home, that says: Travel Adapter, and Adaptive Fast Charging. 🤷‍♀️ same wattage: 10.5. How can a wall plug “Adapt Fast Charging?”

I guess if you’re not tired of this subject already, I’ll see your answer tomorrow. I’m getting my b’s and d’s confused already. Crazy, going to bed at this hour!