In general, the Philippines receive a lot of sunlight (Solar Radiation) no matter where you are or which day of the year. The more sunlight the PV cell receives, the more electrical power is produced. In fact, PV cell converts light sunlight into electrical power even when there is some cloud cover in the sky or when it is completely clouded over. Even artificial light can be used in this way. But, of course, the yield depends on the quantity of light.