I have a low power NAS (~35W) and I want to buy an UPS (uninterruptible power supply) to keep things running. The problem is most UPS for well known brands have an idle power usage (even without load) greater than 20W. It’s comprable with the NAS + HDDs + Network equipment…
Do you know any alternative? UPS battery for 10 minutes will be enough. UPS load could be very low < 50 W. UPS software is optional.
As far as I know the idle power varies from implementations to implementations, especially regarding charging. Also the idle power tends to grow when the battery ages (as the internal resistance increases).
If you are interested in the APC one, it does not hurt shooting them an email asking for the rated idle power usage. From my experience, APC has been pretty eager to respond.