LOL.
Replace the original board. Spend the money. You’ll get it back on resale. Then run one 8 or 10 gauge cable direct to your system quad 20amp outlets. 20amp breaker. No sub needed.
Replace the original board. Spend the money. You’ll get it back on resale. Then run one 8 or 10 gauge cable direct to your system quad 20amp outlets. 20amp breaker. No sub needed.