| Ups
You've asked some pretty broad questions, and I'l give some general answers, advice like mine is worth what it costs.
There are UPS which are full-time UPS, and there are "backUPS" which provide unprocessed AC until the mains fail.
You can get just about what you want, if price is no object.
It's kind of like a like a tow vehicle, one size does not fit all.
And the sine-wave or modified sine wave output also is a customer-type question.
What sort of load is being protected? (light bulbs have a minimal effect on the operation, except for drawing current but motors have quite an effect)
What is the amount of energy that the UPS is expected to provide?
etc.
BEST power systems used to have a good reputation, I would look at their web site.
I'd get with the nearest University and see if one of the professors would mind explaining it all.
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