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Perhaps she is ignorant...the ability for a solar system depends on amount of energy produced which is a function of quantity of the solar cells and sunlight availability.
The ability to use power during times of non power generation is offset either by power coming back from the grid which, in your scenario would be non-existent...an alternative source could be maintained through the use of battery storage...once again the limitation would be quantity of batteries...there are other factors but that is an attempt at simplicity.
With a big enough system you wouldn't need to be attached to the grid at all and the lifespan is almost indefinitely...battery replacement probably one of the bigger long term expenses...or perhaps an upgrade to keep up with the Joneses as the technology gets even better...rapid advances in recent years is making panels and other components more efficient at a more affordable price...about like buying a new TV or telephone in today's world.
To eliminate the use of a generator you use an inverter to change the DC voltage to AC to power standard household applications. (the generator could be used to power the system in lieu of batteries when the sun goes down but not needed if you have the power storage)
Limitations would be related to the size of the system you install, many use solar power that can run all major appliances in an entire household...off the grid.
Well, ideally I would love for my entire home to be run off the panels, and any excess to be sold back to the electric company. But I know that I would have to have a pretty massive system for that to happen, and I was even told that my house is not big enough for all the panels I would need. Does that sound right? I have a 2,200 sf house with a gabled roof.