UPS for a 750w psu

[Astel09]

I need a ups for my pc because my power goes out sometimes and i want to protect it, i just need enough to quickly shutdown the pc 

I dont need to play after the outage just a couple of minutes so i can turn off my pc properly.

 

my pc: https://pcpartpicker.com/list/zMd4cH

[tkitch]

you're going to want a UPS that can deliver at least 750W of power to connected devices.  (PC and Monitor)  

You might be able to get away with a 600ish watt delivering UPS, but that's up to you.

Something like this:
https://www.cyberpowersystems.com/product/ups/intelligent-lcd/cp1350avrlcd3/

 

[mariushm]

You need an UPS with a VA rating at least 1.5x higher than the power consumption of your pc (not the maximum the psu can supply)

 

For your configuration a 1000VA or higher UPS would be recommended.  How much it's gonna power the computer while running on batteries will depend on the capacity of the batteries it comes with and the number of batteries.  You can get a 1000VA ups with a 7Ah battery that's gonna discharge in 5 minutes or you could get a UPS with 2  10+ Ah batteries that could last 20-30 minutes.

[podkall]

4 minutes ago, mariushm said:

You need an UPS with a VA rating at least 1.5x higher than the power consumption of your pc (not the maximum the psu can supply)

 

For your configuration a 1000VA or higher UPS would be recommended.  How much it's gonna power the computer while running on batteries will depend on the capacity of the batteries it comes with and the number of batteries.  You can get a 1000VA ups with a 7Ah battery that's gonna discharge in 5 minutes or you could get a UPS with 2  10+ Ah batteries that could last 20-30 minutes.

If their PC draws 500W, would a 750W UPS be fine despite having 750W PSU?

 

Or is 1000W better because of the Monitor?

[podkall]

14 minutes ago, Astel09 said:

I need a ups for my pc because my power goes out sometimes and i want to protect it, i just need enough to quickly shutdown the pc 

I dont need to play after the outage just a couple of minutes so i can turn off my pc properly.

 

my pc: https://pcpartpicker.com/list/zMd4cH

how's your slightly improved PC going for you so far?

[mariushm]

13 minutes ago, podkall said:

If their PC draws 500W, would a 750W UPS be fine despite having 750W PSU?

 

Or is 1000W better because of the Monitor?

 

Your computer power supply has an efficiency of over 90% but for simplicity let's say exactly 90%  - that means that those 500w given to components are only 90% of the total power consumes from the mains, so the power supply actually consumes 500w x 100 / 90 = ~ 550 watts  to generate those 500 watts.

 

Also, by design the power supply doesn't take the power from the mains in a steady constant power draw, it may take 600 watts for 50 milliseconds, then it may take only 400 watts for the next 100 milliseconds then it may take 700 watts for the next 20 milliseconds ... the AVERAGE will be 550 watts. I'm super simplifying it, technically it doesn't work like this, but it's good enough.

 

So the VA rating of a UPS is basically like the wattage on the power supply, it's the maximum the circuitry inside can generate if something demands it.  And as I said, it's best to be at least 1.5x the expected power consumption.

 

This VA rating is not an indicator of how much time it can power the device.  The battery size defines that and if you want longer time, you need to pay attention to what batteries the UPS comes with.   If you want to make a sort of analogy, the batteries are the gasoline tank and the VA rating is the horse power of the power generator - you can have a  huge horse power generator powered by a tiny fuel tank so it will die fast, or you can use a huge fuel tank and last for hours.

 

 

Yeah, factor the monitor ... figure out how much power it consumes at your brightness level ... I have two 24" on my desk, and they consume only around 30 watts with the backlight at around 80% brightness.  Newer LED backlit monitors can consume more power.

 

Use a kill-a-watt type of device to measure how much devices consume, at 10-15$ a piece, they're cheap enough that anyone should have one around the house ... random amazon example : https://www.amazon.com/Suraielec-Calculator-Protection-Electricity-Electrical/dp/B08GSPLZBN/

 

The difference between a 10-15$ and a 50$ one is more accuracy at lower ranges, but even the cheapest ones are within 5% of actual value at power draws below 20-50 watt, and it's good enough.

 

[Astel09]

12 minutes ago, podkall said:

how's your slightly improved PC going for you so far?

very nice buy i cant access the bios for ram xmp i need to remove the little battery from the motherboard but to lazy rn probably next week would look into it and probably update the bios.

 

[podkall]

1 minute ago, Astel09 said:

very nice buy i cant access the bios for ram xmp i need to remove the little battery from the motherboard but to lazy rn probably next week would look into it and probably update the bios.

 

what do you mean by that? Does the PC start faster than the motherboard screen pop?

[Astel09]

3 minutes ago, mariushm said:

 

Your computer power supply has an efficiency of over 90% but for simplicity let's say exactly 90%  - that means that those 500w given to components are only 90% of the total power consumes from the mains, so the power supply actually consumes 500w x 100 / 90 = ~ 550 watts  to generate those 500 watts.

 

Also, by design the power supply doesn't take the power from the mains in a steady constant power draw, it may take 600 watts for 50 milliseconds, then it may take only 400 watts for the next 100 milliseconds then it may take 700 watts for the next 20 milliseconds ... the AVERAGE will be 550 watts. I'm super simplifying it, technically it doesn't work like this, but it's good enough.

 

So the VA rating of a UPS is basically like the wattage on the power supply, it's the maximum the circuitry inside can generate if something demands it.  And as I said, it's best to be at least 1.5x the expected power consumption.

 

This VA rating is not an indicator of how much time it can power the device.  The battery size defines that and if you want longer time, you need to pay attention to what batteries the UPS comes with.   If you want to make a sort of analogy, the batteries are the gasoline tank and the VA rating is the horse power of the power generator - you can have a  huge horse power generator powered by a tiny fuel tank so it will die fast, or you can use a huge fuel tank and last for hours.

 

 

i have small 600va ups an old one probably would buy a new one just need enough time to turn off the pc  normaly

[Astel09]

Just now, podkall said:

what do you mean by that? Does the PC start faster than the motherboard screen pop?

i turn off quick start i smash f2 f12 and delete but just boots to windows i saw in reddit you need to remove the battery in the motherboard to get to the bios.

[mariushm]

Just now, Astel09 said:

i turn off quick start i smash f2 f12 and delete but just boots to windows i saw in reddit you need to remove the battery in the motherboard to get to the bios.

Just unplug the hard drive / SSD , and plug your usb keyboard in a USB 2.0 port in the back, if the board has any.

 

Without an operating system (because drive is disconnected), the Bios will have no choice but to let you in the bios to choose a boot drive. So go and set XMP and save settings, shut down (hold power button for 5+ seconds), put hdd/ssd back.

 

[Astel09]

1 minute ago, mariushm said:

Just unplug the hard drive / SSD , and plug your usb keyboard in a USB 2.0 port in the back, if the board has any.

 

Without an operating system (because drive is disconnected), the Bios will have no choice but to let you in the bios to choose a boot drive. So go and set XMP and save settings, shut down (hold power button for 5+ seconds), put hdd/ssd back.

 

nice idea will do that later in the week rn im enjoying the pc. just need the ups

[GuiltySpark_]

Big fan of the CyberPower CP1500PFCLCD

[tkitch]

1 hour ago, podkall said:

If their PC draws 500W, would a 750W UPS be fine despite having 750W PSU?

 

Or is 1000W better because of the Monitor?

So, if components draw 500W

The PSU will use probably 550-600 (tops) 
And then 100-150W for the Monitor.

 

So, 750 is a "good overestimation" for what they need to not be overdrawing the UPS 

[podkall]

21 minutes ago, tkitch said:

So, if components draw 500W

The PSU will use probably 550-600 (tops) 
And then 100-150W for the Monitor.

 

So, 750 is a "good overestimation" for what they need to not be overdrawing the UPS 

So 750W would be like "bottom barrel" situation, where you'd get just enough time to turn off PC, and probably shouldn't engage in anything intensive while it's running as well?

[tkitch]

7 minutes ago, podkall said:

So 750W would be like "bottom barrel" situation, where you'd get just enough time to turn off PC, and probably shouldn't engage in anything intensive while it's running as well?

no.

The wattage is what the UPS can provide to the devices running on battery.
The battery capacity is separate and has nothing to do with wattage.

[podkall]

13 minutes ago, tkitch said:

no.

The wattage is what the UPS can provide to the devices running on battery.
The battery capacity is separate and has nothing to do with wattage.

I'm just assuming, lower W rated UPS, will most likely have smaller battery, I'm not saying low W UPS always has lower capacity battery, I just assume for the sake of realism, budget and expectations.

[tkitch]

18 minutes ago, podkall said:

I'm just assuming, lower W rated UPS, will most likely have smaller battery, I'm not saying low W UPS always has lower capacity battery, I just assume for the sake of realism, budget and expectations.

Sort of?

 

there are a lot of caveats that go into these, so it bears some research.

[Astel09]

good news i tried another keyboard and got through to the bios xmp profile 1 baby 6000 mhz lessgo next gonna update bios but need to buy the ups first

[Astel09]

is this a good ups https://www.amazon.com.be/-/en/Uninterruptible-Line-Interactive-Computer-Display-Sockets/dp/B07NS2VK7J