The electrical panel is required to be:
Accessible, Readily (Readily Accessible). Capable of being reached quickly for operation, renewal, or inspections without requiring those to whom ready access is requisite to climb over or remove obstacles or to resort to portable ladders, and so forth.
I can think of one just off the top of mt head
incoming poco power is fluctuating,at meter is fine next place to go is panel,how do you test from meter to panel without testing it open.30 x 36 maintains that clearance