What UPS would you use for remote network switches

My main APC UPS is on year 3 with it's current batteries and it's still doing fine. However, I will be bringing in a technician to run some tests to ensure that this is the case. The city I am in recently had a major power outage in it's downtown core. My UPS kept our systems up and running for 25 minutes until it was restored. I was quite impressed.

Keep up regular maintenance and have a technician look over your solution. It's a small price to pay to avoid being left in the dark.

Clean power is determined with an oscilloscope and frequency meter. A voltmeter isn't enough, it only shows you RMS voltage to let you know the system is supplying power and if it's capable of supplying voltage at the load you have on it. For the SmartUPS 2200, nominal output is 120V with a less than 5% variance at full load.

The frequency meter tells you how well the UPS is calibrated to output 60Hz power. It can go off tolerance over the years. The SmartUPS is supposed to sync with the grid as long as it's got power and hold the frequency to 57 - 63 Hz when delivering offline power.

The oscilloscope is necessary to make sure you're getting a clean sine wave without power spikes, noise, etc. which is what "clean power" is all about. Some of the original UPS systems output a square wave or stepped square wave attempt to simulate the normal sine wave delivered by the power company. APC systems like your SmartUPS 2200 are spec'd to deliver sinewave output, but if the output switching transistors are having problems, this may have distortion, stepping or noise disrupting the delivery of a clean sine wave output.

Also, at 10 years old, I would also suspect any MOV protection the system has to offer has degraded pretty badly. Metal Oxide Varistors can only take so many power outages, spikes, etc before they lose their ability to suppress the hash spikes that are thrown at them.