If you're not pushing things hard (or don't mind overnight charges) you can get away with a surprisingly svelte power supply. Technical Specifications Brand : Apple Part Number: A1343 Fit for : Macbook Pro 15-inch and 17-inch Type: AC Power Adapter or Charger Input: AC 100-240V1.5A, 50-60Hz DC Output: 16.5-18.5V -4.6A Power Output: 85W DC Connector : Magnetic (MagSafe 1) DC Connector Style : 'L' shape DC Connector Pin : 5 pins (The middle pin is smaller than the other fours) Adapter Color : White Origin : Brand New. If I was running the GPU and CPU together at max power all the time, I'd absolutely be draining the battery. I don't even think the USB-C hub that I have hooked up to it can pass through more than 65W. Its not uncommon for adapters to be put in poorly. Apples adapters can get quite hot and do have a temperature sensor in them that will shut it off if it overheats. If your adapter isnt working, the first thing you should do is unplug it for a while. The 144W one has sat in a drawer since I got it my old 96W supply is in another part of the house and I plugged the Magsafe cord into that. Macbook Pro AC Adapter not working Tech Asst Septem18:05 Updated Follow. I just haven't gotten around to replacing it with a more powerful brick yet. My laptop is just 'on' with personal stuff (IM clients and so on) during the workday and iStat Menus says it's drawing 7-12W most of the time for the SoC. The AC plugs included in the World Travel Adapter Kit directly support outlets in North America, Japan, China, United Kingdom. It is compatible with Apple USB-C Power Adapters, MagSafe and MagSafe 2 Power Adapters, 10W and 12W USB Power Adapters, and Portable Power Adapters.

I get away with a 45W power supply on that desk because it's part of a multi-machine setup, and I'm mostly working on another machine. (1) 2-Pack Generic Apple MAC AC Power Adapter US Wall Plug Duck Head for iBook/iPhone/iPod, for Macbook 11 inch 13 inch 45W 60W, Macbook Pro 15-inch /17-inch 85W Power Adapter Charger (White) Type: Plug Head. The kit is designed to work with iPod, iPhone, iPad, and Mac notebooks.

My suspicion is with a 45W charger and a 16' you can probably run a workload that will drain the battery when plugged in, but AS is pretty efficient so you're really have to work for it.

Ac adapter for macbook pro