Question Choosing UPS

juanfropro

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Aug 25, 2018
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I'm looking to buy a ups for my PC to save from ocasional power outages.

PC parts:
CPU: AMD Ryzen 5 3600 3.6GHz
RAM: 2 Sets, Corsair Vengeance LPX DDR4 3200 PC4-25600 16GB 2x8GB CL16. (total 32GB)
Motherboard: Asus TUF GAMING B550-PLUS
PSU: Corsair RM750 750W 80 Plus Gold Full Modular
GPU: Sapphire Pulse Radeon RX 580 8GB GDDR5
SSD (OS W10): Samsung 850 Evo SSD Series 120GB SATA3 (5 years old)
SSD 2 (Programs): Crucial MX500 SSD 500GB SATA
HDD (Data): Seagate Barracuda ST4000DM004 4000GB Serial ATA II
Other: 4 port USB PCIe slot. I have a Valve Index Headset, a HOTAS, webcam, keyboard and mouse. 2 Monitors

There is a lot of literature around but not much consistency.

My main doubts are dimensioning and the wave type.

How big (or small) should I go? I just need enough time to gracefuly shut down the PC when the power goes down.

I've read that pfc PSUs need a pure sine wave, but most of the ups I've seen have simulated or pseudo sine wave. Is the same thing?
 

Prad_Bitt

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Jul 4, 2020
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I'm looking to buy a ups for my PC to save from ocasional power outages.

PC parts:
CPU: AMD Ryzen 5 3600 3.6GHz
RAM: 2 Sets, Corsair Vengeance LPX DDR4 3200 PC4-25600 16GB 2x8GB CL16. (total 32GB)
Motherboard: Asus TUF GAMING B550-PLUS
PSU: Corsair RM750 750W 80 Plus Gold Full Modular
GPU: Sapphire Pulse Radeon RX 580 8GB GDDR5
SSD (OS W10): Samsung 850 Evo SSD Series 120GB SATA3 (5 years old)
SSD 2 (Programs): Crucial MX500 SSD 500GB SATA
HDD (Data): Seagate Barracuda ST4000DM004 4000GB Serial ATA II
Other: 4 port USB PCIe slot. I have a Valve Index Headset, a HOTAS, webcam, keyboard and mouse. 2 Monitors

There is a lot of literature around but not much consistency.

My main doubts are dimensioning and the wave type.

How big (or small) should I go? I just need enough time to gracefuly shut down the PC when the power goes down.

I've read that pfc PSUs need a pure sine wave, but most of the ups I've seen have simulated or pseudo sine wave. Is the same thing?
It doesn't matter much about the wave. Simulated (stepped sine wave) works fine. I have a BX1100C by APC, with an RM650 2019 plugged into it, works just fine. I am not really sure why you have a 750W PSU, 650 is more than enough for those parts... Which means APC BX1100C will work. UPS usually have VA rating (technically same as W but not actually same) so you need to look for something that's like 600-650W (1000-1100VA) or above. You have 750W PSU but it's never going to draw that much because your system won't ask for it

And. For time to shutdown and stuff like that... I once read a formula I think it is this

(Watts used x 12)/(your mains output voltage 110 or 220 whatever) = Ampere.hour (Ah) rating (of the battery) for one hour of use

So the BX1100C is 660W rated, and I have a 220V wall output so for me

Which is 36Ah

The BX1100C has 14.4Ah if I'm not mistaken, so it'll work for about 20 mins under 660W load from a 220V wall socket. I'm not very sure about this formula, but I think it was this
 
Last edited:

Prad_Bitt

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Jul 4, 2020
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I've seen in some reviews that UPSs can be a little loud, is that continuous or just when is actively working?
Mine is not loud at all, my pc's case fans are louder lol. When it's on mains power no issue, when on battery I can hear a little coil whinne type thing but that's about it. An earlier unit had a very loud coil whine I'd say about 40db. Returned it. Got new. Now maybe... 15? Too low to notice anyway
 
I've read that pfc PSUs need a pure sine wave
That is incorrect. Only really cheap or really old PFC controllers freak out when the AC isn't a pure sine wave. I've never used a pure-sine UPS in my life.

but most of the ups I've seen have simulated or pseudo sine wave. Is the same thing?
Simulated, step, square... they're all the same.
 
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