Hello Serge Yes, it is normal for the fans to shut off completely when not running on the battery. It may be possible that there are situations when the fans would not be running even if on battery power, but the information I found stated that it is normal for the fans to shut off when not running on battery power so I assume that they will always be on when running on the battery. Thanks
I have a Dell UPS 2700 in a rack with Dell servers and other equipment a load of less than 10%. I noticed that the front and back fans are off.  The UPS manual states the fans runs at low speed when the load is less than 80% and at high speed above.  The LED panel does not show any problems.  Is it normal for the fans to be off? Thanks, Serge
Dell UPS 21700 Fans Off