Customer Reviews

Needed to replace my APC ES350. So I decided to go with this model since I have the larger 1500 versions that have been running for years without a problem. It has been a few months now using this for my modem/router and it has performed amazing. What I replaced was actually the second ES350, which honestly are junk, they typically die within a year and replacing the battery only extends this another 3-6 months before the rest dies, usually killing a good battery inside. I went through 2 ES350 models within 30 months which is abysmal when my XS1500 models have been running for years flawlessly (only need to replace the batteries every 3-4 years).

On March 5, 2011 a huge thunderstorm with hundreds of lightning strikes caused a main power line to fall in the alley. It sent 7200 volts into my home. Blowing out the master breaker and the complete breaker panel. I was working at the computer when I heard the blast in my house and all the lights went out except my computer. The BK350 kept everything running until I shut it off a few seconds later. It protected the Computer, Scanner, Printer, Work Light and a Radio. Two days later when our system was restored I turned on the computer. It would come on, but not stay on. I hit the reset button on BK350 and it exploded internally. I removed it and put a backup in place and the computer ran fine. It saved my computer and accessories.

I assume this product will work well when needed. APC products generally do. However, I have 1 gripe and 1 kudo. Good: a paper with the model & serial numbers is taped to the side of the unit. This is handy for registration. Avoids need to remove plugs to read sticker. Bad: despite bragging that they have room for 2 transformer plugs, they do not. At least not if one is a 2 blade style. Mine covers other plugs.

We used to sell a lot of these to a couple of our regular clients. These are a great size/function/cost combo for someone with a typical office desktop setup - PC, couple of monitors, desktop printer, etc. Small enough to keep relatively hidden under a desk but will provide more features and (potential) longer run-time that the smaller, cheaper options that APC sells. Recommend.

We installed 5 of these about a month ago. We had a power outage on 10 June 2010 and they worked exactly like they were supposed to. Very smooth transfer to the APC, just as smooth when power came back on in 10 minutes. We are very happy to have installed these before our usual round of power outages, they usually occur once every week or so. Keep up the good work.

First one lasted more than 10 years, finally got a little weak this month (September 2019). It was connected and protecting our computers and hard drives 24/7! Almost forgot we had it... 11 trouble-free years! You can't ask for more than what this BK350 gave us. All pros, no cons.

I've owned mine for 4 years without issue until now. The Battery cracked, but didn't leak into the unit. Even with a cracked battery it still worked, only found the problem while cleaning the dust out. The replacement only costs $39.00 and will buy it now to keep using the unit.

I have purchased BK350s in the past and have had great success with them in helping me to protect my equipment. However, I am presently having difficulty installing the software for auto shut down. I understood that the new software would work with Macs.

old software documentation doesn't match the software, which is odd since the software itself hasn't been updated in 5 years so how old does that make the documentation? I replaced the battery in my UPS but the software (v3.0.2) reflects I have less than 1 minute of battery. The documentation says to reset the battery replacement date, but where? It does not say, and looking at the most recent (again, 5 years old) software interface provides no indication where I can do that. Nor is there any place to trigger a battery self-test, which is also mentioned in the documentation. So, if I can't get the unit to recognize a new battery I may just change to a different vendor. In the apc forums someone said they used a really really old version of powerchute (v1.x) and in that version they were able to reset the replacement date. This shouldn't be necessary. Plus, this site no longer provides those other versions for download so how am I supposed to try that method if I don't already have an old version archived on my computer from a previous download?

old software documentation doesn't match the software, which is odd since the software itself hasn't been updated in 5 years so how old does that make the documentation? I replaced the battery in my UPS but the software (v3.0.2) reflects I have less than 1 minute of battery. The documentation says to reset the battery replacement date, but where? It does not say, and looking at the most recent (again, 5 years old) software interface provides no indication where I can do that. Nor is there any place to trigger a battery self-test, which is also mentioned in the documentation. So, if I can't get the unit to recognize a new battery I may just change to a different vendor. In the apc forums someone said they used a really really old version of powerchute (v1.x) and in that version they were able to reset the replacement date. This shouldn't be necessary. Plus, this site no longer provides those other versions for download so how am I supposed to try that method if I don't already have an old version archived on my computer from a previous download?