We have a 220 AH "bank" and use 5-6% in a 24 hour period. 200 Watts of solar panel output with a Blue Sky 3024 controller recharges our nightly deficit in less than 3 hours during the winter months.
For us it means we can operate the fridge electronics, the house lights, the furnace motor, and the LED LCD TV, and never need to plug into shore power or fire up a generator. We don't bother with carrying a generator around or its fuel supply and never need to turn it on or shut if off or deal with the noise. Not having need of a generator and its noise provides us with peace of mind - literally.