Aside from the system itself being hidden...

What about actually using it? You wouldn't want to be the only house on the block with the lights on.

I guess what I'm getting at - if one would have to be so careful about using power that only you had available, so as not to draw attention - would one be able to realize much of a benefit of having such a system?

What good is it, in that scenario, if you can't really use your power?

How long could one expect to keep something like that out of the public eye even when being careful?

I'm talking here about a complete whole house, grid tied system - kind that costs $30,000, 4 kW, etc.