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PowerWalker VI 2200VA IEC 1100W UPS
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PowerWalker VI 2200 IEC/UK is a Line- Interactive UPS which provides high performance and reliable and cost-effective backup power protection. The UPS can be automatically started up without AC power supplied. In addition, this UPS provides RJ11/RJ45 surge protection, and green power function for energy saving. Equipped with a voltage stabilizer, this UPS will continue providing clean and stable power to connected equipment and is perfect for any home or SMB (small medium business) application.
PowerWalker VI 2200VA IEC/UK
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Do not use this UPS in conjunction with an IEC to BS1363 socket adapter without first using a socket tester to confirm that the output polarity is correct.
A single pole relay which disconnects the output leaving live connected! A switched neutral connection is a serious safety flaw if one of these UPSes is used in conjunction with a commonly available IEC to BS1363 socket adapter. As IEC connectors are not guaranteed to have a fixed polarity, or may be used in split-phase countries with two live conductors, a double pole relay should be used so that both phases are disconnected when the unit is switched off. While it is not officially specified, all IEC connectors with BS1363 plugs have the same live/neutral layout - and the only one which is being switched in this UPS is the neutral connection.
The swapped polarity on the output is caused by incorrect wiring to the IEC input connector. Pictures are attached of the left/bottom male IEC pin being incorrectly connected to a blue/neutral wire inside the unit.
I have contacted PowerWalker support looking for more information on whether this is this a design flaw common to all of these UPSes, or an assembly failure specific to my unit.
The UPS is totally quiet while online and even charging. Once the battery kicks in however the buzzing is quite loud and gets worse with higher loads.
I did some tests on runtime, 7 minutes at 38% load and 24 minutes at 18% load(about 110w) so their claim of 30 minutes at 100w would most likely be accurate. They do specify in the manual that you must not connect more than 70% load to the UPS.
The software however is average. The windows software works fine on Windows 7 64bit. However I actually wanted this to be connected all the time to an Ubuntu server 14.04. Their Linux software is very outdated and actually caused my server to hang at startup as they are using an outdated method to access usb. In the end I had to install NUT with the blazer_usb driver and spent a few hours getting it working with that. If I had to buy again I probably would buy from another manufacturer that has better Linux support.
Be aware that you are unable to adjust the sensitivity of the AVR(you can do this in a APC unit in the same price range) so if you have fluctuating input voltage as I have at the moment(fault with the distribution board in our building) you might be hearing the clicking of the relay's more often than you would like.
This UPS is not suitable for very low loads. It has an ECO feature that will switch off the UPS after 5 minutes if the load is too low. This cannot be disabled through software but requires a hardware modification that would void you warranty.
My only gripe is that the software asks for a serial number. I presume this was the one on the box & device, but it is actually printe din the manual. Maybe the should call it a "key" or "unlock code"? Remember to look in the manual for the key before binning it!
I did some decorating and turned it off and moved it out of the room to do the decorating. To my surprise a few hours later, I heard the fans of this thing kick in as if it were under load and getting hot. Yet nothing was plugged into and it was turned off ?! But I've now been using it for over a year without a problem and it manages to power my Intel Atom NAS box and all my switches. Living in the countryside we often get power cuts and I don't want my NAS box dying or killing a hard disk during a power cut and so I think this thing has saved me from data loss.
It's not a particularly big box, and surprising at 1100W and it manages to power my intel atom box for about 4 hours when idle before it gives up and turns off. My atom box only uses 40W of power when idle though.
The UPS has a USB socket for connecting up to the computer to shut it down, but I never managed to get the software to work. It says it supports linux and windows and I'm using Ubuntu linux and I managed to get the software installed but couldn't get it to work (admittedly I only put about an hour of effort into it) but I think id rather try some open source NUT alternative software
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