Checking an older Gresham panel
Before a charger goes on a boom-era home, we run a load calculation against the existing service. If it carries the charger, we install the dedicated circuit; if it doesn't, we say so plainly rather than overload an aging panel. Sometimes a load-management device works, sometimes a service upgrade is the right call. A Gresham panel upgrade runs $2,500 to $7,500; our Gresham panel upgrade page walks through it, and pairing the two jobs is often cheaper than two separate visits.