The answer to 'why is my generator flickering lights' is that the flickering is likely caused by a problem with the generator's voltage regulation or load balancing. This can happen if the generator is not properly sized for the electrical load, or if there is an issue with the generator's alternator, voltage regulator, or other electrical components.
Some common symptoms of this problem include lights flickering, electrical equipment malfunctioning, or the generator shutting off unexpectedly. In some cases, the flickering may be accompanied by a humming or buzzing noise from the generator.