Power supply issue for fresh and salt water tanks

Disclaimer - I am posting this question for my wife who is fish tank smart
and computer stupid. I am fairly clueless when it comes to fish tanks. Also,
while my question is regarding both fresh and salt and this group is aimed
primarily at only fresh, I felt that the question was generic enough that I
could post it here. I apologize if I am mistaken.

My wife has a 30-gallon freshwater tank with live plants and an 80-gallon
sal****er tank, non-reef. Both tanks healthy (so she tells me).

Anyway, not to bore anyone, during the summer months we have monsoon storms
that have a nasty tendency to knock out the power. The freshwater has
handled this OK in the past, but she is concerned about the sal****er tank
(which is new) and, although it has handled it OK in the past, she does
stress about the freshwater tank.

Does anyone have any suggestions regarding a backup power supply for these
tanks for those times when the power goes off?

My wife has already suggested a generator, but I am not putting a generator
in the middle of the living room, not very feng shui :-) I am looking for
something that can be hidden in the cabinet or something along those lines.

If you can help you can reach me here or e-mail me directly at
.

Thank-you all.