In message , Jason Arthurs
wrote
Due to our flakey local power supply I'm quite au fait with setting up
UPS units for computers. However my wife is setting up a tropical
aquarium and would like a similar level of protection for her fish.

Total equipment load is miniscule compared to computer equipment.

75W Heater
18W Flourescent tube
6W Filter pump
5W Air pump
----------------------
104W TOTAL

I'm assuming the power factor of the heater will be similar to an
incandescent bulb i.e. approaching unity (1) but the pumps are
presumably inductive mechanisms so would I be looking at 0.75 or
worse? Flourescent tubes would normally have a PF of 0.85-0.9.

Ideally I'd like at least a couple of hours backup since we rarely
have outages long than this, what sort of VA rating should I be
looking for?


A couple of hours without power for a tropical aquarium should not be
problem.
--
Alan