they are getting better. if you live somewhere sunny,
you can put in a 2KW system pretty cheap.. It makes money all day and the energy company should buy it.
Its getting to the point where it actually can be a good deal.
but I'd put my money on it being much better in 5 years or so.
The secret here is you arent running 20 car batteries in a room somewhere.
you design it to be connected to the utility as well.