Electric subpanel/main panel question.
I have a 200 amp main panel to the house (4 years old). The electrician that built the house ran a cable from the main panel to the basement for a future subpanel (ALCAN S stabiloy (R) AA-8000 AL type SE cable style R XHHW-2 600V 3 CDRS). I want to add a subpanel to the basement that I am finishing. The main panel has only one full size (1″) knockout that has not been used. All of the breakers are 1/2″ 15, 20, or 30 amp breakers (except the two 60 amp breakers for a heat pump). I was trying to add a 125 amp sub panel, where I will need 9 breakers. Am I out of luck? What are my options?
Suggestions or help will be greatly appreciated.