Mike 'Flyin'8' wrote:

While ultracaps do
store energy, they are typically only sized to maintain an output load
for a period of about 30 seconds in the flywheel bridge. *This
application isn't really a UPS per se

Why not? As long as those 30 seconds suffice to e.g. get said generator
online, the system serves to maintin power in the event of a utility power
failure, making it an uninterruptible power supply.

Which part of UPS don't I get?

Anno.