APC MAIN-76781 Smart-UPS 1500VA UPS Battery Backup with Pure Sine Wave Output (SMT1500)

This model is even better than the older family this one has a LCD with important information and has multiple ways to configure as a set of ports (group) that can be programmed to turn on/off remotely (bouncing dvr, firewalls or other unresponsive equipment or to control other devices or even lights) Love apc, APC has build a name since I remember APC was always among the names respected for their expertise and performance, for me they are soo good that I even have bought a few for home, this UPS units are flawless as they detect correct and protect power surges, peaks and drops and they will keep you running for at least 10 minutes (at full capacity 900watts) needless to say a regular computer/monitor with a router and a small inkjet printer will last up to 40 minutes of work (I have worked under a full blackout finishing up work and it did last around the 40-45 minutes I was impressed) I would say that the unit was probably at 18 to 23% load at the time using OEM APC Battery Pack ( I would always advise use of oem apc battery packs as they are build using an advanced technology that not everyone can replicate and under load most batteries will perform poorly after a few months while the APC OEM stay strong up to 5 years of use and abuse I seen other units like SUA1500RM2 and SUA3000 under Heavy Loads this units performed Magnificent, I have seen a sua1500 that was 4 years old loaded with a dell t710 and a r210 servers switch and kvm, it was close to 90% and under a storm it took countless power spikes/drops even a 5 minute power outage, you could see the device working even before you even notice anything abnormal, the servers keep working all night with no issues, Needless to say I am bias when it comes to APC they really know their stuff. I have used other brands - home and enterprise - and most of them fail when they under heavy load and under stress, (power blackout or during storms) my best guess is the engineering behind the circuitry that does the inversion and the simply well made transformer, I have seen units power off with depleted batteries and coming right back up after the power is restored like nothing, other brands fail to do so or simply will require the user to turn them on, or will require expensive attachments to perform somewhat like their Great APC counterparts.

I have two of these units, each powering one of a server's dual power supplies (redundant power supplies, and redundant SmartUPSs). These are stable, excellent units with a great amount of battery runtime (on my 150-watt server, I get approximately 90 minutes on each battery). The software they come with works well, except that it can't detect two units, only one, connected USB. I've taken to just uninstalling the software and using Windows' built-in power management for the batteries which seems to work just fine.Good amount of controls and information provided by the alpha-numeric LCD readout. Prior models of this unit seem to last about 5-6 years before the electronics give up and you start getting errors even after replacing the battery, so I'm hoping to get a little longer on this newer generation.In all, very happy with these units; they're quiet and they just work.

I was intimidated because of the reviews complaining about the fan noise. When I installed the device, the fan indeed was loud. But once the battery was fully charged, the fan has either completely stopped or is going too slow to notice.The other reviews are a few years old, so perhaps APC changed the fan behavior since then.I initially bought a CyberPower CP1500AVRLCD to save money and although it said it was going to last long on the battery, every power outage resulted in an instantaneous crash of my PC. It was utterly useless, perhaps because of the sign wave quality on that CP model. So I replaced it with this APC SMT-1500 and the CyberPower is assigned to my router now, all is good.EDIT: I am quoting this from an excellent review by Neil E. Isenberg"This (APC SMT-1500) Has fan (APC estimates 45dB max) which runs when:- The battery charges- The unit supplies battery power- The temperature hits 104F- The load is over 75% of unit wattage capability (675W+)."If that is true, it would be wise to buy a unit that is larger than you need to avoid the 75% load condition. I have a 5GHz custom built gaming tower/room heater and a 25" LCD monitor and it usually does not provide over 12% normal load on this UPS and has never gotten even close to 75%.

My SMT1500 unit makes a buzzing electric sound even when it is completely off and no device is connected to it. This noise is different from noise coming the rear fan unit which is constantly running, no matter what. I have to physically unplug my unit every night to be able to get some sleep. It took me three phone calls to get APC support to send me a replacement unit. When I received the replacement it was a refurbished one with the same problem. I sent it right back to APC. APC even managed to screw up PowerChute, which is their management software. It is bloated, hard to use, and slow. This is the last product, I'll ever buy from APC until they get their act together.

Worked great with x79 system. Works great with x99 system. Had some stability issues but they were traced to unrelated root causes. Unit worked great out of the box (was at 99% charge when I first powered it up).Unit runs very quiet (totally silent) at this time.--Auguest 18, 2016Have had 2 major power outages and each time this unit performed fantastically - keeping my primary computer up and running with plenty of time to peform shutdown. There was plenty of reserve power which I used to keep the WiFi router and cable modem running and was able to keep the mobile phone recharged as well.--May 19, 2019Still have this unit and it has continued to work great. Battery capacity has not yet degraded. I will plan to purchase new batteries from the vendor at the 5 year mark.