If you bought the system in 2022, then you would not enter anything in that section. That is the costs for 2023 only. On the next screen it will ask if you had a carryforward from 2022. That is where you will enter the amount that you have left over from the credit from 2022.
Your payments you make during the year do not play a role in your return at all. The full amount you pay for the system is entered in the year you install it and then from then on out it is only the credit that is left over that is entered on future year returns until you use up the entire credit.
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