850VA/510W Pro UPS Backup Battery Power Supply for Office Electronics,

This is my 2nd APC UPS backup. The first is over two years old and has performed flawlessly supporting a high-end workstation. I bought this 2nd, somewhat smaller model for my office PC. I was pleased with my purchase for six weeks until the first blackout intervention due to a thunderstorm. The UPS did not survive, when the power was restored the device insisted there was a short on the output, which of course there wasn't. The total load on the output is less than 30% of the rating, but even with the load removed it still alarmed. This began a three week adventure: - Amazon does not allow a defective return-replacement (because of the batteries I assume). Beware. - APC has a 3 year warranty but their support process is agonizing. I spent several hours in chat-windows answering inane questions like 'Is it plugged in?' or 'Are you sure there is no short on the output?' At one point the agent (who was obviously multi-tasking) picked the wrong chat-window to type to another customer. That was interesting to sort out. - I finally found someone with a brain who started a swap-process. APC would send a replacement and I would return the defect. - The replacement arrived 10 days after the failure event. I installed it and everything was fine. I re-packaged the defect in the shipping box. But there was no information about where to send it. - Another week passed before I got an email with a pre-paid return label as a pdf attachment. I assume the original item was an infant-mortality so Five Stars for the product. Battery life is over 20 minutes with my load and the PowerChute software puts the system to sleep before the UPS runs dry. It's an imperfect world: screws fall out. Time will tell if this was an isolated event or a chronic problem, but up to now I am optimistic.

ACP Brand is always good. I have 4 in my home office (Work computer, Stable Diffusion dedicated computer, network infrastructure, and electronic music devices). Word of advice, these are not for sustained usage during an outage for a standard desktop. (Which should be obvious to people). Just keep your computer on it, and just one monitor, so if they power goes out, you can save your work and turn off the machine. Make sure non-essential items are on the non-battery-backup plugs. Works great for intermittent outages. Also, waking up in the middle of the nights to beep beep beep-- I don't have to check to see if the power is out-- (not complaining about the noise). It's calm enough to be informative yet alerting.

Lightning struck 3 houses down and fried our modem through the coax line, which also caused the ethernet-in port on our router to go dead. My computer, however, was protected with the APC Back-UPS Pro 850VA and was totally isolated (thank you wi-fi!) I could hear it click over into emergency power as soon as I saw the lighting flash, so I consider this to be tested under fire. The companion software is visually bare-bones but otherwise works great with Windows 11, the app runs quietly in the background and doesn't use much of anything, and is very programmable with the UPS. For mine, if the power is out for 60 seconds, my computer is sent a command to hibernate. Maybe less important, but I hear this protecting my computer from 'dirty power' at times as well. Outside of the regular testing interval, I hear the relays click on the rare occasion the lights slightly dim as well. Unit has been in service for 3.5 years and still performs wonderfully. I like how it's incredibly quiet (UPS of old would alarm annoyingly).

I have used APC for years at work, so got one for home now. This unit is not as good as the bigger units, I am not a fan of the battery terminals and setup, it is not as good as I am use to with APC Been working great though, so 4 out of 5 stars

Bought for backup power at my cabin. Worked perfectly during a snow storm.

PERFECT

Never choose Amazon same day delivery. I have used this option 3 times and every time I received four or more days later. Use the next day option instead and you will most likely get it on time. The APC UPS is great! EZ to install and has already saved my computer at least 4 times. My area suffers from momentary power loss where the power shuts off then return a second later. It has already cost me two computers, three video cards and one monitor in the last 6 months. I bought this to stop the damage it causes by sudden power loss then voltage spikes when power returns. Paid top dollar for surge protectors and it did no good. If you want true protection for your equipment buy this. You can download software from APC web site that allows your computer to shut down properly in the event a power failure would exceed the battery time of the UPS. Make sure you buy one that will supply enough wattage to power the equipment you plan on hooking up to it. also make sure it is rated PFC compatible as some computers require this to work correctly with a UPS. It is now the 1st of January and so far this UPS has saved my computer from 5 power losses. No lost files and no excessive wear and tear on equipment. Highly recommend this.

I've owned many APC products over the years (mainly UPS devices for servers) and they have always performed well. This unit is a nice size for a home office computer. The menus allow you to configure sensitivity which is nice. Attaching the battery leads when you first get the unit is a little sketch but once you get the main power wire to settle down then it's fine. Lead acid type battery, so it's rather heavy. APC used to provide a Lithium based solution (which I've used also) and i tend to prefer that. This model is nice also for the cost. I like how the screen shows minutes remaining.

Really nice shape. Decent display. Plenty of power. Compared to CyberPower this is much nicer. No stinky smells or burning smells. Only real issues are the plugs are too close to each other at the back. The coax cable and Ethernet ports on the back are useless as well since nobody uses these because they create latency and issues with speed and signal loss. No need for these on any UPS. My model is the 850VA. Price is a bit high as well, but quality seems decent. We shall see how long it lasts.

Just bought this recently and received it yesterday. Bought for my aquarium to keep filter and heater running in case of power outages (which we have a lot of in winter). Easy to use. Just plugged it in, plugged the filter/heater in the backup sockets. Tested it by unplugging the unit...filter kept flowing with no interruption. If I think of it, I'll give another review in 6 months or so after I've had it all winter. So far so good. Update (Feb 9/19): Had the power go out a few times and it kept the HOB filter of my aquarium running without interruption for hours. I only have the HOB plugged in as that's the most important, especially if I'm not home and HOBs don't use much power so this can keep mine running for hours and hours.

This device is a must for any computer plugged in any home that has electrical tension variance. It can save your computer from the recycling bin. Most of all, it will save you heartache. No longer have computer freeze! I plugged my computer and monitor as well as my rooter and Mediatrix in the batterypack -the rest is on an independant power surge bar. Provides time to log off network, save documents, and turn computer off SAFELY. Also provides a landline in case of emergency and be used to charge mobile batteries.

Setup quickly and worked well!

Using it for my Starlink dish which draws about 110Watts and for the ethernet line between the POE injector and the router. Works great. Alarm can be set to mute as default. Display can be always on or on for a few seconds after button press.