darwichee90 said:

Hi

I have the new Macbook pro 16 M1 Pro. And also got a monitor with USB C 65W PD. I Can´t turn off the charing function on the monitor, so i was wondering if it´s dangerous for the laptop itself, to charge the laptop using this monitor? Because it has a 140W otherweis?

chrfr said:

It's not dangerous in the least but the charger may not keep up with the power demand of the computer if it's working hard.

BLBL said:

I have monitor that has 60W PD from USB-C. It does not allow to turn PD off, it automatically detect if computer support it. But how MBP M1 Pro 14” acts in case I have monitor with 60W PD and included 67W Magsafe charger also connected to it at the same time? I would prefer if laptop in those cases would only take power feed from the Magsafe charger and disable PD support from USB-C during that.

astorre said:

What would happen if you connected multip… - Apple Community

discussions.apple.com

Fishrrman said:

Back in the firewire days, it was possible to buy a "data only" firewire cable that DID NOT transmit "bus power" through the cable.

I'm wondering if anyone sells a USBc "data only" cable now? That doesn't transmit bus power?

I tried a few quick searches and found nothing. Does anyone have a source for such an item...?

BLBL said:

So would it be safe to assume that in case on MBP 14" M1 Pro that comes with 67W Magsafe charger and using that at the same time with the monitor that gives 60W USB-C PD, it would automatically take power only from the Magsafe charger and not "advertise" power input from USB-C to monitor at all?

Is it so precise that even with the monitor which has 65W USB-C PD output, it would still use 67W Magsafe instead it both were connected at the same time?

I'm asking this since I put much more trust to Apple original power supplies than that of from some third party. Also I guess using monitor PD output would just heat up the monitor mainboard/power supply more and possibly causing some negative to monitor where panel gets heat from those parts.

Click to expand...

astorre said:

for mac juice is juice, doesnt matter where its coming from, adapter or monitor, you wont get more quality power from original mac charger, for example my 65W anker charger gets way less hot than original 67W apple charger

also I think you're overthinking this, that monitor is built for PD, its not like they accidentally put that function there and once you use it it will melt all components, unless maybe if you're using some cheap fake brand fished from deep China

darwichee90 said:

Hi

I have the new Macbook pro 16 M1 Pro. And also got a monitor with USB C 65W PD. I Can´t turn off the charing function on the monitor, so i was wondering if it´s dangerous for the laptop itself, to charge the laptop using this monitor? Because it has a 140W otherweis?

spiderman0616 said:

I have it set for optimized battery charging, and it's able to both ramp up to 100% quickly if I need it to, as well as hold a steady 80% when it's docked.

Long story short, I think these cables and power supplies are now smart enough to not damage your computer.

BLBL said:

How long it takes until battery optimization starts to work once you leave it plugged all the time?
Also if you occasionally use it on battery and/or select that it charges battery fully to 100% and then return it back to charger, how long it takes until it drops it again to 80% and keeps there?

I'm wondering if sporadic use mess up this and takes weeks to return to optimized state or is it clever enough to return that immediately?

You haven't noticed MacBook display suffering from heat? Like bluish patches appearing on full white image or similar using it clamshell mode?


Yeah, I know device itself takes what it needs for the power supply and regulates itself but I was just wondering how well MacBook handle possible situation where power supply is giving a lot of ripple (DC containing some AC)? That is possible with power supply, especially cheap/badly designed or simply aged power supply where capacitors are failing.
That possible ripple is know to damage parts in many different gear or at least causing them to malfunction.

Click to expand...

spiderman0616 said:

It takes a few weeks at first, but I think it operates on a rolling average, so when I do use it off the charger, it usually starts maintaining 80% again next time I plug in. I don’t pay a ton of attention honestly—it’s become pretty reliable.

jaytv111 said:

I think the Mac laptops just take the first power supply you plug in, then reject power from any subsequent power supply. So you can plug in the Magsafe cable into the MacBook first, then plug in the monitor and it will stay powered by the Magsafe power supply.

BLBL said:

So it does not just see which is the best source but just use what is plugged in first? Does it stay in the plugging order even if your reboot or turn off the machine or monitor with PD in between without removing the cables?

Anyone here actually using monitor with USB-C PD and have cable directly from monitor USB-C to MacBook AND also have Magsafe charged plugged in? It could be nice if someone with this combination would chime in.

BLBL said:

OK, so once you have gotten it to state where is maintain battery at 80% it will return to that mode fast even if you use it on battery occasionally.

spiderman0616 said:

jaytv111 said:

I tested it out with the Apple adapter (it has HDMI, USB-C and USB-A), I was wrong. You can plug in the Magsafe after plugging in the USB-C and it will use the Magsafe. I think in the USB-C only MacBooks it would stay on the first one.

BLBL said:

Does it still increase charge cycles while it is constantly plugged in? I mean does it continuously use a little battery then charge back to 80% and repeat that over and over again, or is it so clever that it "disconnect" battery from use and charging and takes power machine needs from the power supply until you disconnect it? I think that would need to follow what happens to charge cycle count in say couple of weeks continuous use with constantly plugged in without any use on battery. Anyone done that?

spiderman0616 said:

I really don't pay attention to the charge cycles on it, especially because it's a work machine, but it keeps the battery at a steady percentage pretty consistently.

If I shut the laptop completely down and then boot it back up, I think it goes up to 100% again and then back down to 80, but I'm not sure.

BLBL said:

How many watts your USB-C PD and Magsafe charger provide?
I guess if Magsafe is more powerful that is obvious reason for what happened, but if USB-C is higher then it sounds like clever enough for preferring original power supply over "third" party one.