What to consider when buying a UPS?
What to consider when buying a UPS?
Hello!
My new home and local neighborhood have been experiencing brownouts every few weeks. The electricity for my entire house will switch on and off briefly. It’s not a major issue, but the short interruptions are enough to disrupt my work. For optimal performance, I think investing in a battery surge protector would be wise.
Here is my PSU model: GIGABYTE GP-P650B "650 Watts" 80 PLUS Bronze Certified Power Supply (GP-P650B)
I have an LG "38WK95C-W" monitor ("60 Watts"). Full specs:
https://www.lg.com/ca_en/monitors/ultrawide/38wk95c-w/
I’m not sure about my modem.
I think these are the only three devices that need protection.
I’m evaluating these two Uninterruptible Power Supply Systems:
CyberPower CP1500AVRLCD3 Intelligent LCD UPS System, 1500VA/900W, 12 Outlets, 2 USB Ports, AVR, Mini Tower, Black
Amazon Basics Line-Interactive UPS 1500VA 900 Watt Surge Protector Battery Power Backup, 10 Outlets - Black
Here are my questions:
They both deliver 900 Watts. That’s more than what I need. But the only other options I found on Amazon were 600 Watts, which is less than my PC PSU.
What does “1500VA” mean? It seems to be a key feature of these UPS systems, and I’m unsure how my hardware fits in with this requirement.
The first one claims it will last “8 hours.” That feels excessive since my power cuts only last seconds. I don’t need a battery that lasts hours.
What other factors should I consider?
The chart indicates a charge duration of 8 hours, while the run time is specified as 10–12 minutes. This discrepancy highlights the difference between total charge capacity and operational runtime.
Visit the apc website.
They offer a calculator tool for estimating an ups.
In case this serves as a useful illustration, I'm connecting an APC Back-UPS RS 900MI (900VA / 540W) to the following devices:
A desktop PC equipped with Ryzen 5950X and 4070 Ti (1000W PSU)
An LG OLED monitor
A Netgear Readynas 202
A Zyxel 2.5gb network switch
When I'm simply browsing on my APC, it reports a power consumption of 140W and estimates about 24 minutes of operation if power were interrupted—just as others have mentioned, this is essentially the time to safely shut everything down. Of course, during a brief blackout it would handle it without trouble.
While playing Forza Horizon 4, my usage spiked to 240W, and the system predicted roughly 13 minutes before power loss. Even with a 1000W PSU (which is quite high), my 540W UPS still functions adequately. From my view, your UPS doesn’t need to surpass the wattage rating of your PC PSU.
It’s clear that the power draw varies depending on the system and activity. If there were a method to determine this more precisely, it would be beneficial. Additionally, I’ve previously used HWINFO with a USB connection to my PSU, which made monitoring straightforward.
The only additional note I’d make is that some recommend using a pure sine-wave capable UPS; I haven’t used one and haven’t encountered any problems, though the outcome may vary.
If you need extended power during outages, this involves a significantly higher cost.
Yes, batteries in UPS systems are gradually recharged, which limits their ability to manage repeated outages.
If you have some technical knowledge, a lead acid UPS can be adapted to accommodate bigger external batteries—though these options tend to be quite costly.
Another affordable method is to purchase used data center or rack UPS units and repurpose them for larger storage needs.
The "1500 VA" standard matters for professionals, yet for everyday users the WATTS measurement is more practical. These ratings indicate a maximum power capacity of 900 W, which represents the highest power they can supply when the main supply is interrupted.
Hello everyone -
As the saying goes: "Computer users fall into two groups. Those who do backups and those who have never had a hard drive fail." That was a memorable quote from a Gentoo user's message board from back in 2003. Today's computers don't use hard drives; we rely on SSDs which are less likely to fail. Regardless, in this case we're facing power outages that cause my PC to restart, but the same idea applies - my important data is safely stored in Dropbox. My local files match what's in the cloud. Other projects I work on in Google Docs with automatic saving also mirror their cloud versions, and my web development tasks are saved automatically as well, reflecting my remote repositories on GitHub. All my information is protected. The only thing missing is the way I manage my many virtual workspaces in Gnome and the careful setup of my web browser windows. It's a hassle to adjust everything, but I'm confident my data remains safe and nothing valuable is lost.
In my experience, it usually takes a few seconds for power to drop. This is the issue I'm trying to address.
Noted.
As many have noted, the UPS batteries I'm thinking about are only expected to last about 3 to 10 minutes. That fits my main need: to handle brief power interruptions. Since the pandemic and beyond, my work setup allows me to stay at home. If a short outage occurs, my lights will flicker on and off so I'll know it's happening, but my PC will keep running smoothly. For longer outages, I can quickly switch from my laptop to my PC and shut it down in under a minute. That should cover me.
I chose the CyberPower model, ordered it yesterday on Amazon, and it should arrive today at home.
Thanks to everyone for clarifying my questions.
I hadn't encountered this discussion before placing your order.
A significant factor when evaluating contemporary computer power supplies and UPS systems is understanding the distinction between genuine sine wave and simulated sine wave.
Modern power supplies aiming for high efficiency depend on very pure power, meaning a clean sine wave with minimal harmonic distortion.
Without such clean input, they often fail to meet their rated performance and dissipate more energy as heat.
This becomes particularly problematic if you operate a computer using a generator that doesn't produce a true sine wave—such as a non-inverter model.
Inadequate power can harm the power supply itself.
Using a UPS for short periods typically doesn’t stress it heavily, but when running longer or near its rated capacity, issues arise.
Cheaper UPS units or power inverters usually run on car batteries, which cause computer power supplies to shut down immediately upon detecting poor input quality.
These devices emit square waves instead of the desired sine wave, making the situation even more severe.
Generally, a true sine wave UPS is preferable for computers, televisions, or other advanced electronics.
It may not drastically change performance, but testing it after purchase would be wise.
Allow the UPS to charge fully before connecting it, and verify your computer can run smoothly on battery power.
If your computer is extremely sensitive, consider returning the unit.