Basically there are two ways to decide if your system needs to be cleaned and
how often to clean solar panels so you can finally decide what's best for you. First, by physical inspection. If there's a lot of debris, dirt, bird stains, it's time to get to work. Second, through a solar panel monitoring system or microinverters . If you notice that the performance of your panels has decreased, dirt could be the cause. You can determine the correct frequency by comparing performance before and after cleaning. Generally, once or twice a year is enough, but the cleanliness of your panels depends on the weather and the region in which you live.