The solar credit reduces line 18 to as close to zero as possible. So if your line 18 is $000 and your solar credit is $3000 then you will reduce your tax liability to $1000 and there is no solar credit to roll forward. If your line 18 is $2000 and your solar credit is $3000 then your line 18 is reduced to zero and $1000 rolls forward.
If your question is "can I choose not to use all of my solar credit this year and save some for next year even though I still owe taxes for this year?" then the answer is no. You have to use as much as possible this year and then - if there is any left - it will roll over.
@ozturkender
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