Changing Sub-panel tax credit per Inflation Reduction Act

I will be installing heat pump in 2023. As part of the heat pump change, I may need to change my sub-panel (not main panel). The current sub-panel is 100A, and it will be replaced with a new sub-panel which is again 100A.

 

Questions
1. I want to know, whether this sub-panel change will have tax credits, when I do along with heat-pump?

2. How much tax credit will i have for a sub-panel change? Will it be 30% of all costs (or) will it be only $600 max?

 

Thanks!