That's called a Static bypass and most commercial UPS setup's
incorporate one. These days its the only way you can legally do
maintenance inside the UPS without dropping the load. It's also another
reason why the UPS inverter stays insync with the mains. So the static
bypass can be switched
For a truly paranoid setup, you can put an additional ATS *after* the UPS.
This potentially lets you replace a failed or failing UPS without downtime.
One time, this saved me because the UPS took a catastrophic surge to its
input side, but the inverter and batteries kept powering the network.
A generator ATS and UPS setup are not trivial configurations. The whole
system needs to be engineered by a qualified engineer with experience in
those sorts of setups. Both for Australian Wiring rules and also to
ensure all your earth/neutral bonds are at the same potential. If you
end up
Has anyone fed a generator into an automatic transfer switch? We got a
generator recently, which is hooked up to some circuits in our server
room, that can be manually switched between mains and a generator. We also
have an existing UPS that most of the room runs on, and has a runtime of
about
