Always turn off the Imac everyday?

surfbug

macrumors regular
Original poster
May 20, 2017
114
5
I didn't turn off my pc instead it was sleep. Do I always turn off the imac every day?
 

revmacian

macrumors 68000
Oct 20, 2018
1,745
1,448
USA
I didn't turn off my pc instead it was sleep. Do I always turn off the imac every day?
It's really down to personal preference. However, there are a lot of housekeeping tasks that run in the background and these tasks can't run if the machine is turned off. I leave mine on all the time and this practice hasn't shown to cause problems over the years. macOS is based on BSD so it might benefit you to learn a bit about BSD and how it works.
 
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JustMartin

macrumors 6502a
Feb 28, 2012
768
244
UK
My personal feeling is that if there's going to be any stress on the system it will be in temperature changes and one of the avoidable causes is the power-off and on cycle. But, others will tell you that the computer is better if it gets rebooted every day because it flushes out any memory leaking programs. It used to be a matter of pride back in the day when you could look at the number of days your Mac had gone between reboots as opposed to the likely number of hours on a Windows machine. In all likelihood it probably doesn't matter either way and the time saved on a machine coming back from sleep as opposed to off is not great
 
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Moonjumper

macrumors 68020
Jun 20, 2009
2,265
1,951
Lincoln, UK
My imac is in my bedroom. If I don't shut it down, the imac will occasionally wake. And occasionally this wakes me.
I have a similar issue. My computer used to be in a separate room and I'd walk past the door in the morning and it would be awake, which puzzled me as I lived alone. It tracked it down to turning on my bedside light causing my Mac to wake (not always, intermittent faults are harder to find). I assume it is related to a small disturbance to the electrical supply.
 
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Allyance

macrumors 6502
Sep 29, 2017
374
426
East Bay, CA
Last night my iMac didn't go to sleep on it's own, so I got out of bed and turned it off manually. Next morning it turned itself on at it's normal wake up time of 6 AM. Weird.
 

26139

Cancelled
Dec 27, 2003
4,315
370
Wait, Macs have off buttons? ;)

I do sleep any monitor, albeit an external or an iMac, as often as possible though and turn them off if I can.
 
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4sallypat

macrumors 6502a
Sep 16, 2016
625
627
So Calif
Not needed. I just restart from scratch if I run into a problem - aside that Macs are very resilient, no matter if you put them to sleep or shut them off.
Same here, never shut any of my Macs down unless I get a glitchy reaction...
iMac, 16" MBP, 13" MBP, 13" MBA, 12" rMB all on 24/7.

On the extreme side, my Xserve is powered on 24/7 with battery backup power and dual 750W redundant power supplies in the garage due to the fan noise...
 

vkd

macrumors 6502a
Sep 10, 2012
911
311
You can save a bit of power (electricity) shutting it down when not in use. If your energy bills are cheap as chips this may not apply to you. Or if you are a privileged-birth type person ;)
 

26139

Cancelled
Dec 27, 2003
4,315
370
You can save a bit of power (electricity) shutting it down when not in use. If your energy bills are cheap as chips this may not apply to you. Or if you are a privileged-birth type person ;)
Sure, but isn't that mitigated by wear and tear on the computer starting up from a cold boot?
 

Freida

macrumors 68020
Oct 22, 2010
2,390
3,185
I haven't switched off my computers for years. The only exception is when Something is off, when there is an update or when I travel. Otherwise, I put it to sleep each night. No issues there.
In fact, I would dare to say that constant switching on & off might actually be more harmful to the computer (because of sudden electricity spike) than anything else.
So, sleep it is. :)
 

fuchsdh

macrumors 68000
Jun 19, 2014
1,604
970
It's better from an energy perspective to shut it down when not in use. It's probably better from a hardware longevity standpoint to keep it running. Either way with a modern computer as long as you're using sleep settings the difference is probably negligible either way.
 

TheIntruder

macrumors 65816
Jul 2, 2008
1,179
713
A 2019 27" iMac 5K consumes a bit over a quarter of a watt (0.27) when it's "off." (AKA Standby, according to Apple)

When it's sleeping, that figure rises by about a watt (1.23).

If one were to take a year-long vacation, and not touch their iMac, it would be the difference between 2,365 Wh, and 10,775 Wh.

According to the EIA, the average residential electricity rate in the U.S. is 13.04 cents per kWh. Hawaii has the highest rate, at 30.99 cents, Louisiana the lowest at 9.47 cents, though hydro-rich Washington and Idaho are close.

Using the average figure, over a year:

$1.41 (Sleep)
$0.31 (Off)
$1.10 Difference

Don't spend it all in one place!

Whatever your rationale may be for choosing Sleep or Standby, electrical cost isn't going to be a large factor.
 

_Skyfire_

macrumors member
Aug 16, 2017
94
50
A 2019 27" iMac 5K consumes a bit over a quarter of a watt (0.27) when it's "off." (AKA Standby, according to Apple)

When it's sleeping, that figure rises by about a watt (1.23).

If one were to take a year-long vacation, and not touch their iMac, it would be the difference between 2,365 Wh, and 10,775 Wh.

According to the EIA, the average residential electricity rate in the U.S. is 13.04 cents per kWh. Hawaii has the highest rate, at 30.99 cents, Louisiana the lowest at 9.47 cents, though hydro-rich Washington and Idaho are close.

Using the average figure, over a year:

$1.41 (Sleep)
$0.31 (Off)
$1.10 Difference

Don't spend it all in one place!

Whatever your rationale may be for choosing Sleep or Standby, electrical cost isn't going to be a large factor.
Thx that was informative! I have been wondering, would anyone know the electricity consumption for an iMac that is on (not asleep), screen turned off?

I have had an issue with Bootcamp where the screen is stuck at full brightness after waking up from sleep. Would be cool to do a similar cost calc on what it costs to leave the iMac on overnight
 

vkd

macrumors 6502a
Sep 10, 2012
911
311
A 2019 27" iMac 5K consumes a bit over a quarter of a watt (0.27) when it's "off." (AKA Standby, according to Apple)

When it's sleeping, that figure rises by about a watt (1.23).

If one were to take a year-long vacation, and not touch their iMac, it would be the difference between 2,365 Wh, and 10,775 Wh.

According to the EIA, the average residential electricity rate in the U.S. is 13.04 cents per kWh. Hawaii has the highest rate, at 30.99 cents, Louisiana the lowest at 9.47 cents, though hydro-rich Washington and Idaho are close.

Using the average figure, over a year:

$1.41 (Sleep)
$0.31 (Off)
$1.10 Difference

Don't spend it all in one place!

Whatever your rationale may be for choosing Sleep or Standby, electrical cost isn't going to be a large factor.
I made a practical test and found that overnight a 2011 iMac 27" on Sleep mode consumes about 0.5 kWh, so for a month its 0.5 x 30 = 15kWh.
For a year 12 * 15 = 180kWh.

YMMV.
 

MandiMac

macrumors 65816
Feb 25, 2012
1,189
619
I made a practical test and found that overnight a 2011 iMac 27" on Sleep mode consumes about 0.5 kWh, so for a month its 0.5 x 30 = 15kWh.
For a year 12 * 15 = 180kWh.

YMMV.
Wait: 500 Wh sounds pretty high. In 8 hours this would mean 62,5 watts per hour. My iMac with the screen off and idling uses around 20-30 watts. What did your iMac do? Or is your night 12 hours long?
 
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vkd

macrumors 6502a
Sep 10, 2012
911
311
Wait: 500 Wh sounds pretty high. In 8 hours this would mean 62,5 watts per hour. My iMac with the screen off and idling uses around 20-30 watts. What did your iMac do? Or is your night 12 hours long?

They tell you it only uses 20-30 watts but you do a practical check and see if its right in your case or not.
 

MandiMac

macrumors 65816
Feb 25, 2012
1,189
619
They tell you it only uses 20-30 watts but you do a practical check and see if its right in your case or not.
That‘s exactly why I used a power meter and measured it for myself. An Intel processor rated for 65 watts uses 65 watts under full load, not when idling around.
 

retta283

macrumors 68000
Jun 8, 2018
1,763
1,558
Kingman, AZ
I shut mine down almost every night. Just feel safer with it off, mostly because I have to unplug things every few hours (limited outlets) and if I keep it asleep I'll accidentally unplug it while it's asleep. Just less things to think about.
 
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