While UPSes are quiet in the dead of space, they do make noise back on earth. The fans inside cool the components that are always working to provide power conditioning. These fans come on and off, creating some noise. But if you really cant stand the fan noise from a real UPS, we have 3 ideas.
- Buy some BackUPS units, they dont make noise because they really dont do anything
- Buy a japanese water fountain that will drown out the fan noise
- or Buy a 1kva SmartUPS. Most 1000va units are the same size and shape as the 1500va units, but they dont need a fan to cool them. So buy up the 102b rackmount or APC 100v tower.