The answer to 'what is panel upgrade' is the process of replacing an older, outdated electrical service panel (also called a breaker box or fuse box) with a new, higher-capacity panel. This is often necessary when a home's electrical needs have increased over time, such as adding major new appliances, HVAC systems, or electric vehicles.
A panel upgrade typically involves having a licensed electrician replace the entire service panel, which includes the main breaker, individual circuit breakers, and all the wiring that connects the panel to the home's electrical system. This ensures the home has enough electrical capacity to safely power all its electrical loads without overloading the system.