I do not understand why i did not get my solar tax credit. how can i get this so my payments do not go up?

The solar energy tax credit is a non-refundable credit.  It can only reduce your tax liability to zero.  You can see the details of your Solar Credit on Form 5695.  Look on Lines 15-16.   

Under the Residential Energy Efficient Property Credit, you can get a federal tax credit for installing alternative energy equipment, such as solar electric property, solar water heaters, geothermal heat pumps, small wind turbines, and fuel cell property.    After entering the amounts in TurboTax, you will be shown a screen that details the amount of your credit.  If your tax liability is already at zero, you will see the amount listed as a carryover that you can use in future years.