The answer to 'panel upgrade keeps tripping' is that a tripping circuit breaker in an electrical panel is often caused by an overloaded or faulty circuit. This can be due to too many appliances or devices drawing power from a single circuit, a short circuit, or a ground fault. Symptoms may include flickering lights, outlets that don't work, or the circuit breaker tripping repeatedly.
To troubleshoot, start by identifying which circuit is tripping and reducing the load on that circuit. This may involve unplugging devices, turning off lights, or moving some appliances to a different circuit. If the issue persists, it's best to call a licensed electrician to inspect the panel and wiring for any underlying problems that need to be addressed.