1st thing I would do is get ahold of your power company...( you will at some point anyways) they can tell you if any rebates are out there or are going to be out there. Its not uncommon to see a 30% rebate from power companys. Normally to get that you have to jump thru a couple hoops for them( like finance with this company, or use this panel and etc) but that 30% could very easily be 5k or better.