I have two remote-controlled ceiling fans that turn on after a power outage ends.  At full speed, no less  On full speed my condo is like a wind tunnel.

plug in a 240 volt adjustable time delay relay - the type used to be common for aircons etc to prevent the compressor powering up straight after a power glitch/spike 

 

small DIY kits can be got too 

typical eBay time delay kit example 1 

 

 

This type works well, but needs more connecting effort...

ebay 220 v delay module example 

various models give the choice of Minute or Seconds variable delay action... auto resets 

6 hours ago, sometimewoodworker said:

9 hours ago, Max69xl said:

A desk top computer is not supposed to be turned off every night and especially not for a longer period. That's because the power supply in the computer is backing up the 5V BIOS-battery using a 5V stand by which is always on when the computer is plugged in.

Do please get your facts right. The battery is there to keep the clock running and has nothing to do with the BIOS that is stored in NVRAM. 
 

if you aren’t going to use the computer for around 12 hours or more then turning it off is a reasonable choice.

 

Correct, and the battery isn't rechargeable either, as they are 3V CR2032 batteries

7 hours ago, Susco said:

 

Correct, and the battery isn't rechargeable either, as they are 3V CR2032 batteries

As you say the battery usually isn’t a rechargeable one. The size is dependent on the computer maker, yours is not the same as the last 10 I have had.

1 hour ago, sometimewoodworker said:

As you say the battery usually isn’t a rechargeable one. The size is dependent on the computer maker, yours is not the same as the last 10 I have had.

 

Your last 10 PC's must have been something special I guess, because generally it is a CR2032 battery, and yes the RAM in which the BIOS is stored is powered by that non rechargeable battery.

 

https://en.wikipedia.org/wiki/Nonvolatile_BIOS_memory

 

Nonvolatile BIOS memory refers to a small memory on PC motherboards that is used to store BIOS settings. It is traditionally called CMOS RAM because it uses a volatile, low-power complementary metal-oxide-semiconductor (CMOS) SRAM (such as the Motorola MC146818 or similar) powered by a small "CMOS" battery when system and standby power is off.^[1]

 

CMOS battery

 

Type CR2032 button cell, most common CMOS battery.

The memory battery (aka motherboard, CMOS, real-time clock (RTC), clock battery)^[3][4] is generally a CR2032 lithium coin cell. This cell battery has an estimated life of 3 years when power supply unit (PSU) is unplugged or when the PSU power switch is turned off.^[5][6

19 hours ago, Max69xl said:

That's because the power supply in the computer is backing up the 5V BIOS-battery

Incorrect. The bios battery is not a rechargeable type

1 hour ago, stouricks said:

20 hours ago, Max69xl said:

That's because the power supply in the computer is backing up the 5V BIOS-battery

Incorrect. The bios battery is not a rechargeable type

Actually double incorrect as the BIOS needs no battery.

 

1 hour ago, Susco said:

Your last 10 PC's must have been something special I guess, because generally it is a CR2032 battery, and yes the RAM in which the BIOS is stored is powered by that non rechargeable battery.

The BIOS is usually in a EEPROM or ROM so no battery needed. If it were not so then a dead or missing battery would brick the computer, some settings and the clock need the battery.

 

None of the computers were special they needed a 

the standard for these for many years.

6 minutes ago, sometimewoodworker said:

1 hour ago, Susco said:

Your last 10 PC's must have been something special I guess, because generally it is a CR2032 battery, and yes the RAM in which the BIOS is stored is powered by that non rechargeable battery.

The BIOS is usually in a EEPROM or ROM so no battery needed. If it were not so then a dead or missing battery would brick the computer, some settings and the clock need the battery.

 

None of the computers were special they needed a 

the standard for these for many years.

 

So you say these are all liars

 

https://www.google.com/search?client=firefox-b-d&q=cmos+batteries

17 minutes ago, sometimewoodworker said:

Actually double incorrect as the BIOS needs no battery

But any changes you have made to the BIOS will need the battery, otherwise the PC will boot to default BIOS which, as you say, are stored on a non-volatile chip.

1 hour ago, stouricks said:

But any changes you have made to the BIOS will need the battery, otherwise the PC will boot to default BIOS which, as you say, are stored on a non-volatile chip.

BIOS = Basic Input Output System

 

There is sometimes argument over if BIOS means only the static firmware code (held in ROM or flash memory) or the complete startup package including memory for variables and real time clock.

 

One argument would say the BIOS needs a battery, the other says no battery required.

 

As this is a 'startup system' requiring several component parts to function correctly, saying it requires a battery is the safer option.

BIOS doesn't need a battery.  BIOS settings and the clock does.  BUT, this has nothing to do with the OP so if you all need to argue about this further, take it to the computer forum.  Cheers.