Mac sleep mode power consumption

Articles

  1. Shut Down Or Just Let It Sleep - Which Is Best For Your Mac?
  2. iMac For Dummies, 8th Edition
  3. How to set system sleep delay on macOS Mojave
  4. How to Put Your Mac in Sleep Mode Automatically - dummies

Shut Down Or Just Let It Sleep - Which Is Best For Your Mac?

When you put your Mac to sleep, most everything including the disk and of course the display, are powered-down, but a "trickle" of power remains to certain components. At the typical electricity rate of about 11 cents per kilowatt-hour, an iMac or Mini sleeping 8 hours per day will add about one cent per week to your power bill.


  • Putting Your Mac in Sleep Mode.
  • Set system sleep delay.
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Even a Mac Pro just under 7 watts would be under a nickel. In addition, the process of powering-up a "cold start" takes considerable energy. Writing the RAM's contents to the startup drive is a safeguard.

iMac For Dummies, 8th Edition

Should something happen, such as battery failure, you can still recover your data. The processor is put into a low-power state. The video output is disabled. Connected displays will enter their own low-power state if supported. Apple-supplied hard drives will spin down. Third-party internal and external drives may spin down most do.

How to set system sleep delay on macOS Mojave

Optical media drives spin down. Ethernet port is disabled. AirPort functions, if any, are disabled.

Should you Hibernate, Shut down, or put your PC to sleep?

USB ports have limited functionality respond to keyboard. Audio input and output are disabled. Keyboard illumination, if present, is disabled. Expansion card slot is turned off portable Macs. Modem, if present, is disabled. This depends on whether the modem is configured to wake when it detects a ring. Bluetooth is disabled. This depends on the Bluetooth system preference, which can allow Bluetooth devices to wake your computer.


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  • How to fix MacBook battery drain while in sleep mode?
  • 1. ‘Laptops use less energy than desktops.’.

They just keep voltage on the RAM to keep it alive. Also I have external hard drives that do not spin up when I come out of sleep but do when I reboot.

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User profile for user: traisjames traisjames. Mac OS X Speciality level out of ten: 0. I have done some testing with my kill-a-watt here at my college and one was that a macbook pro or macbook's pro uses about 2 watts of power when in standby. I did all this because my college Northland College in Ashland, WI leaves its computers on 24 hours a day M-F, and about 8 hours on weekends, and being in the environmental council, I wanted that changed, so I started compelling number to prove that it would be better to turn them off. Note that our college has a population of about Below is some numbers that I have copied out of an excel file for your view pleasures.

How to Put Your Mac in Sleep Mode Automatically - dummies

Sorry if it looks funny now. Let me do this The two other computers listed are laptops. When I get a chance, I will put everything I have up there so you can view all my data. From the guy with his eye on the sky, Travis.

User profile for user: S. Kaliko Trapp S.

Kaliko Trapp. Notebooks Speciality level out of ten: 0. Nov 3, AM in response to traisjames In response to traisjames Thanks, Travis, for the excellent info. Perhaps you could have someone look into fixing it, as the information is very relevant considering the recent push in our universities to reduce electric use.