Understanding PD Wattage

[nmeed]

Let's take a look at the Anker PowerPort Atom for iPhone 12 charger which is a 30W PD charger. If we look at the output, it tells us:
Output: 5V ⎓ 3A/9V ⎓ 3A/15V ⎓ 2A/20V ⎓ 1.5A

I read that as it outputs at 15 watts, 27 watts, and 30 watts. At the same time, I know that once you get over 80% or so on the iPhone, the charging speed slows significantly. As such, I highly doubt at 95% on your iPhone this sucker is still pumping out 15 watts. Then again, it doesn't list anything lower than 15 watts output. Can someone please explain what I'm missing?

 

[Jimpilot]

Let's take a look at the Anker PowerPort Atom for iPhone 12 charger which is a 30W PD charger. If we look at the output, it tells us:
Output: 5V ⎓ 3A/9V ⎓ 3A/15V ⎓ 2A/20V ⎓ 1.5A

I read that as it outputs at 15 watts, 27 watts, and 30 watts. At the same time, I know that once you get over 80% or so on the iPhone, the charging speed slows significantly. As such, I highly doubt at 95% on your iPhone this sucker is still pumping out 15 watts. Then again, it doesn't list anything lower than 15 watts output. Can someone please explain what I'm missing?

I’m not an expert but i think it varies the amps to what your phone can accept. The numbers listed are max amps at each voltage. As it nears a full charge the amps drop off

 

[nmeed]

I’m not an expert but i think it varies the amps to what your phone can accept. The numbers listed are max amps at each voltage. As it nears a full charge the amps drop off

That makes a lot of sense!