Avoid this dealer -- he's lowballing you.
I wish I were kidding, but... I find that newbies start out with the expectation that they will get a lot more capacity from solar than they do. That's my personal experience, anyway.
The catch-22 of solar is that it works best in climates where you need the refrigeration (A/C) that it is least able to power.
I'll let somebody answer you who has solar and is happy with it.