VI 2200VA/1200W LCD IEC Uninterruptible Power Supply with AVR Stabilizer, RJ-11 Surge Protection, HID Support and LCD Screen

One year on updateSo today powered up the attached devices and the UPS fan kicked in - it is noisy - looking at the Winpower manager software it showed "Output: AVR mode" - hadn't seen that (or the fan running) before - work comes first so I just left it - a couple of hours later the fan stopped - Winpower manager showed "Output: Normal mode" (see picture). You can see the input voltage is 249V - when it was in AVR mode the input voltage was over 250V (upto 254V) - it seems the UPS was protecting devices from over voltage. Made me think the reviews that say the fan run all the time might be due to supply overvoltage.Would buy this model/brand again.Working from home you notice all the power cuts and blips - already had Jackery power stations but they are offline and I still lost work when the mains power fails - got a small APC UPS to power modem, router and 4G backup modem but needed somthing bigger for a large tower pc, its 3 screens, 2 laptops external screens and sundry hubs - this power walker UPS 1200w seemed suitable and very good value - it worked - the windows monitoring sofware reports 18-20% load and a 22-24 minute expected run time - didn't need to test as soon after it was installed there was a power cut - allowed plenty of time to bring the Jackerys online (powering the UPSs) - probably paid for itself first use - can't hear it over the tower pc in standby - makes lots of noise and beeps during a power cut (which is good) and some noise while recharging - front blue lcd display is easy to read but not too bright - And don't forget you also need light in a power cut - keep some rechargeable torches handy

My old Eaton EX 1500 UPS (which was in excess of 6 years old) recently stopped working properly and, after finding the correct replacement batteries, I was told it could also be a fault with the internal charger responsible for maintaining the batteries. So I started looking for a whole new UPS. I did a few loops of Google, Amazon as well as APC's website (which wasn't enjoyable to use) and, after finding hardly any reviews and definitive information on which UPS to buy on Google or so called 'specialist' websites, I went with this Powerwalker 2200.First impressions are that this UPS is fantastic! In normal mode it's almost totally silent - so if you work in a home office you won't notice it over the usual hum of your computer - which is great, as my old Eaton EX 1500 had a fan that was always on. During normal operation, there's a slight buzzing noise, but it's barely noticeable - it's likely just the internal components managing the input/output voltage as well as being ready to balance the load if there's a power cut.The unit itself is pretty small and unobtrusive, it just weighs quite a bit for its size - which is probably just the weight of the batteries inside.I spent a lot of time looking for a suitable UPS and I'm really happy I chose this one. For the price it's great value, as I'm confident I'll get 30-45mins of run time if we have a power cut (based on another person's review and my initial tests). I'm powering a 24" Dell monitor, a mid-2010 Mac Pro tower and a vinyl cutter used to make stickers.The cold-start feature works well too - simply turn it on and you've got instant access to 240v, without it being turned on at the wall. When you simulate a power cut (turning the UPS off at the wall) the load instantly gets taken up by the UPS with zero latency.An issue with 90-degree UK IEC plugs: If you haven't got one already, you'll need to buy a multi-gang power cable/adaptor as the UPS doesn't come with one, so you won't be able to plug your computer in, etc. Make sure the gang socket cable doesn't have a 90-degree IEC plug, as the cable doesn't clear the ground/surface when it's plugged into the back of the UPS. The IEC cable needs to come straight out of the back of the UPS... hopefully that makes sense? See the photos I've included.Overall, though, If you're on the fence, definitely buy this UPS as it'll cover all of your needs if you need to have an 'insurance policy' for your computer equipment if you have a power cut.

Just wanted to leave a review for the next guy because when setup I had some annoying buzzing.Firstly, the unit powered up straight away and seems to function without issue. Tested turning the plug off at the wall to check it fails over to battery perfectly fine.However, when first powered on - there was a high-pitched buzz. Similar to a coil buzz on a capacitor which came on and off every 5 seconds roughly.Was going to send the unit back as it's in a quiet office but thought I'd just leave it for a few hours. After about 2 hours the buzz completely stopped and it's now silent. So seems to be while charging the battery; I can deal with that for the price of this unit. It's not an APC, but it's good enough for a small home-office.EDIT: The buzzing returned. Every 5 seconds the buzz would be present again. Due to me being in such a quiet office this had to be returned. However, don't be put off if you're buying for a cupboard or server room. It'd work great for that.