You should look into any state programs being offered,there is also a 30% federal tax rebate.I am still regreting not having a system installed after we bought our house.Should have used the home buyers tax credit towards it but we had other expenses and landscaping the backyard for the kids and unexpected sewer issues.In some states the rebates are so good,plus the srec credits on top of that it is very cost effective.I guess you are in NY state and I'm not sure what kind of programs are available there.But if you can have a system pay for itself within 10 years it should be a good investment.Most systems have a 20-30 lifespan.You want to have micro inverters installed on every panel,its complex but you end up generating more wattage.
http://www.enphaseenergy.com/products/m ... videos.cfm. 6-7 dollars per kw is the going rate I beleive,the bigger the system the lower the cost.You have to have a southern facing roof to get maximum generation.Do some internet searching on it and you will find installers,especially if your state has a rebate program.I have a cousin in NJ who was approached by a installer,basically she will get a system for free if she signs over here srec credits for the next 10 years.A 6kw system might produce 7 credits per year which have a $700+ per credit value last time I checked.Here is a link to the guy who I delt with
http://www.solaruniverse.com/northernpennsylvania he may not be able to install for you but may be able to point you in the right direction,he's a franshise of a very large installer.Or here is another link which I was looking at
http://www.solareps.com/?utm_source=afc ... ystonehelpThere is alot to understand in solar but it isn't too complex,do your own research and calculations,there is a big rush to install systems with all the money being thrown around by states and the feds.You have to know if its right for your location,budget and future returns.Good luck and I'll poke around for other links I have and post them.