On Sun, 25 Aug 2019 14:57:31 +0100, Andy Burns
wrote:

Scott wrote:

I have always assumed that an uninterruptible power supply must be
energy inefficient for the same reasons as stand-by uses electricity.
Is this a correct assumption

a UPS generally does consume a background amount of power, how else do
they cook their batteries with heat? The amount will vary depending
whether it's an offline, online, or line interactive type.

Thank you. This is what I suspected. Could you quantify at all?
Would a domestic UPS use more power than, say, a TV on stand-by?