Okay ish for the money, but buying something that works in the near future.

The included management software is absolutely terrible. It often locks up using 100% of one thread on the CPU, and also managed to render all of the COM ports on my machine unusable by keeping them open to scan for RS-232 UPS's. It was so bad I wrote my own software for it. Need I say more? If you want your machine to auto shut-down, buy a different unit. (if you wish to write your own UPS software, take a look at the Network UPS tools source code for command sets.)

All the UPS circuitry is very inefficient, to the point where it works very well as a footwarmer...view more Okay ish for the money, but buying something that works in the near future.

The included management software is absolutely terrible. It often locks up using 100% of one thread on the CPU, and also managed to render all of the COM ports on my machine unusable by keeping them open to scan for RS-232 UPS's. It was so bad I wrote my own software for it. Need I say more? If you want your machine to auto shut-down, buy a different unit. (if you wish to write your own UPS software, take a look at the Network UPS tools source code for command sets.)

All the UPS circuitry is very inefficient, to the point where it works very well as a footwarmer. Although this means due to thermal limits it cannot actually supply high loads for long periods of time. Internal temperatures sit at 70C just idling on mains power with the battery fully charged.

The output is a square wave. Not all mains equipment likes to run off square waves.

To top this sorry lot off, it has 'crashed' on me, flipping to battery mode for no reason and 5 seconds later shutting down. This took out my desktop and 2 servers. Other machines not on the UPS stayed up, and no lights dimmed indicating a brown out.

If you actually want to protect devices against power-outages, DO NOT BUY THIS UNIT. Or any of the defender range. I imagine they will all suffer the same set of issues.

I bought this back in 2016. It works well as a simple battery backup BUT if you want the functionality of automating the shutdown of your computer you need the comms cable to be plugged in. Having the cable plugged in causes the device detection noise to continually go on and off (about every 10 seconds) as it "plugs and unplugs" effectively. This is a real issue when you have the audio on your computer and you hear the connect and disconnect tone while trying to listen to something. Similar to if you plug in and pull out a USB stick into a slot. I thought there was something wrong with the unit so got in touch with the manufacturer to...view more I bought this back in 2016. It works well as a simple battery backup BUT if you want the functionality of automating the shutdown of your computer you need the comms cable to be plugged in. Having the cable plugged in causes the device detection noise to continually go on and off (about every 10 seconds) as it "plugs and unplugs" effectively. This is a real issue when you have the audio on your computer and you hear the connect and disconnect tone while trying to listen to something. Similar to if you plug in and pull out a USB stick into a slot. I thought there was something wrong with the unit so got in touch with the manufacturer to be told "We confirm that you serial number Defender1200 will behave as you describe as this is normal for this device".
Very disappointing. I've unplugged the comms cable now and use it without any smarts. ie. just a battery backup when the power goes out.

I'm using this to supply a small NAS with power until it can safely shut down and an ONT, router and hub. I'm happy with the way it is working. Make sure you grab the latest software from the website as it gives access to a couple more features. I'm using this to supply a small NAS with power until it can safely shut down and an ONT, router and hub. I'm happy with the way it is working. Make sure you grab the latest software from the website as it gives access to a couple more features.

So far I have used it for about 3 weeks. As we live rural we use it as a backup for our wireless internet and phone connection, it should be able to keep our connection going for about 6 hours if we have a power cut. The only negative so far is that the sockets for surge protection only and surge protection and backup are orientated differently and also don't allow enough space to use power supplies next to each other. I needed to use a power board in between to use two power supplies in the backup circuit. So far I have used it for about 3 weeks. As we live rural we use it as a backup for our wireless internet and phone connection, it should be able to keep our connection going for about 6 hours if we have a power cut. The only negative so far is that the sockets for surge protection only and surge protection and backup are orientated differently and also don't allow enough space to use power supplies next to each other. I needed to use a power board in between to use two power supplies in the backup circuit.

This is a great value unit and have used them for servers and desktops. USB cable for communication works well. Use only the Windows Netguardw 1.01 off the website http://powershield.com.au/ not the JAVA/Web based software that is on some cdroms. Allows configuration for shutdown. Email communication for self test, battery replacement etc. Easy to replace batteries after 3 years by pulling off the front. 3 Battery backed ports for you computer and 3 surge only for your Laser printer. Reliable as well. Great price, great piece of gear. This is a great value unit and have used them for servers and desktops. USB cable for communication works well. Use only the Windows Netguardw 1.01 off the website http://powershield.com.au/ not the JAVA/Web based software that is on some cdroms. Allows configuration for shutdown. Email communication for self test, battery replacement etc. Easy to replace batteries after 3 years by pulling off the front. 3 Battery backed ports for you computer and 3 surge only for your Laser printer. Reliable as well. Great price, great piece of gear.

Purchased this to protect a couple of items from short term power cuts and power surges. Seems to be doing OK as the devices have never had a problem since they were hooked up to the UPS. Purchased this to protect a couple of items from short term power cuts and power surges. Seems to be doing OK as the devices have never had a problem since they were hooked up to the UPS.

This UPS is a big step up over my old one. The previous one was only 390W and my game machine overloaded it constantly. It now protects my server.

The new UPS covers my gaming machine beautifully being 720W This UPS is a big step up over my old one. The previous one was only 390W and my game machine overloaded it constantly. It now protects my server.

The new UPS covers my gaming machine beautifully being 720W

Easy to setup, Worked immediately. No problems Easy to setup, Worked immediately. No problems

The software is extremely basic and not really what I would expect for the product. But the UPS does its job well and prevents lots of annoyance at our inconsiderate landlord.

It handles lots of short power outages just fine with 30 mins of backup time (not including gaming which takes that down to 15 mins). The software is extremely basic and not really what I would expect for the product. But the UPS does its job well and prevents lots of annoyance at our inconsiderate landlord.

It handles lots of short power outages just fine with 30 mins of backup time (not including gaming which takes that down to 15 mins).

Found the back up battery very good but the software they tell you to install from NetGuard has a warning about downloading it as it has an EXE extension, But I went on and downloaded it, now my computer will not start up
Lyndon Found the back up battery very good but the software they tell you to install from NetGuard has a warning about downloading it as it has an EXE extension, But I went on and downloaded it, now my computer will not start up
Lyndon

Simple setup - worked straight out of the box. Remote PC shut down function was simple. Pleased I puirchased it. Simple setup - worked straight out of the box. Remote PC shut down function was simple. Pleased I puirchased it.

Great UPS. Works as expected over USB to shut down computer and communicate battery information. Very happy. Great UPS. Works as expected over USB to shut down computer and communicate battery information. Very happy.