Hi, I need to file form 5695 (2023). What amount I should put in solar energy cost? Is that the total cost of solar system or the amount I financed the system this year?

I filed form 5695 (2022) and got a part of my full solar credit. So, I need to file Form 5695 (2023) to get a part or full of the rest credit. But, what amount do I need to put into line 1 "solar energy cost"? Is that the amount I only financed my system last year or the total cost for the installed system? Thanks