My understanding is that your total tax credit for 2009 (after Jan. 27, 2009, before Feb. 2010) would be 15% of your total expenses up to $10,000, but the first $1000 does not count. That is from $2000 to $10,000, you can get $1,350 tax credit (I think it is non-refundable). It does not matter how much you spend on each project. Good luck.