I am also good at understanding UPS stuff as have taken diff pangas with it.
I have a 2kva (2600 watts) 24V ups (double wet batteries) in house as well as in office.
Wiring was done by electrician.
Full office runs on UPS, and for extra load extra switches have been installed from the main board for A/C's and refrigerator.
And as for my house. All tube lights, fans and enery savers are being connected to UPS and are ON subject to the usage.