Surge Protector/UPS

Furman F1500 UPS with Additional Battery Power


In Use

I connected several components to the F1500 that were using 430 watts as shown on the previous page. I turned off the circuit breaker, and the F1500 went into action. It shut down my computer, although I had plenty of time to do this manually. For those of you who might purchase this product just for a single computer, the front panel display said there were 77 minutes of battery power available should the AC go down (I only had one computer connected to the F1500 for this test).

I performed an FFT analysis on the output of the unit when it was connected to a live AC wall socket, and shown below is the spectrum of the F1500 (red graph) vs. straight out of the wall AC (yellow graph). You can see that the F1500 does indeed filter some of the AC harmonics, especially above 3 kHz. There actually was a bit more noise with the F1500 in the 400 Hz - 2 kHz range. In any case, its output is much like other home theater power conditioners. The difference is, that with the F1500, you don't lose power to your hi-fi equipment if the AC goes down.


Like most modern UPS these days, when the F1500 is called into action, it generates a 60 Hz sine wave at 120 volts. This is clean power that is available during your component shut down. However, it would be nice to have that clean power all the time, not just when the wall power is out, but during normal use, the wall AC is connected to a battery charger which is connected to the batteries, and what you get at the AC receptacles on the rear of the unit is the AC from the wall. It is only when the wall power goes off that you are getting your AC from the batteries through the sine wave generator and voltage regulator. The only way to get that clean sine wave generated AC is from the batteries when there is no incoming AC (with its noise) because the AC lines connected through the battery charger to the batteries.

There needs to be some technology developed that isolates the battery charger from the noise in the wall AC lines. This has not been accomplished yet.

However, the F1500 does filter some of the noise, just not as much as we would like.

In terms of which components to connect to the UPS, I would certainly suggest the projector, computer if you are using it as a media server, surround sound processor, and your network router.