The answer to 'when to replace panel upgrade' is that it's generally recommended to upgrade or replace your electrical panel every 25-40 years, or sooner if you experience issues like frequent tripped breakers, flickering lights, or an outdated or unsafe panel. As homes and electrical needs evolve, older panels may become overloaded or unable to handle modern power demands, posing fire and safety risks.
Upgrading your electrical panel can improve the safety and efficiency of your home's electrical system, and may be required if you're doing a major home renovation or adding new high-powered appliances. It's best to have a licensed electrician evaluate your panel and make recommendations based on your specific needs and the condition of your home's electrical system.