If ya DIY,, 6 to 10 grand.
To have it done, 12 to 20 K.
It's going down,,
To be able to get a "net" meter in AZ, you have to have a licensed solar installation/electrician do the work...
But if you just want the panels, no one is stopping you from plastering your roof with 'em.
I'm going to do this in a couple years, if not sooner. The utilities will reimburse you so many $$ for every installed watt of solar. Just about cut the cost in half... at least here in AZ...