Silent power, pretty much.

When I bought my first Delta 3 and started using it, for about 4 months I was convinced that the fans didn’t work. I had not heard them at all, then one day I plugged in something that made my Delta 3 work a bit harder and sure enough, the fans do work, but wow they are quiet. I compared that near silent operation to a neighbours petrol generator which can easily be heard 200 yards away so can’t be used at night without annoying everyone. I’m very happy with our choice of backup power. Due to the fact that on some level we are hopefully the architects of our own happiness, I reserve the right to make myself even happier in the future, by expanding my setup at some point.