I have just upgraded from a quiet SMX1500RM2U to a loud SRTL1500RMXLI. I was going after the Lithium-ion battery, but I did not realise that the fan would be always running at full speed on the new SRTL1500RMXLI. Is there any possibility that APC might develop a firmware for the SRTL1500RMXLI that would allow variable fan speed/control? I have the UPS installed in my home office with ambient temperatures around 20 degrees Celsius, and with constant full speed fan it is running at a very low internal temperature. I am sure it could easily run with the fan at much lower RPM during normal operation just as the older SMX1500RM2U.
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