The energy generated from a rooftop solar plant depends on different components like the capacity of the solar plant instated, adaptation of the roof, amount of insolation received, etc. Therefore, it needs a sufficient number of solar panels to hold as much energy as possible.
When exhibited to direct sunlight, a distinctive rooftop solar panel produces about 300 watts in one hour, i.e. in a typical day during summer, containing 10 hours of daylight; it can generate around 3000 watts or 3 kWh per day.
When it comes to a larger unit, an average 1MWP plant produces 17.50 lacs units per annum. As there are different varieties of solar panels, it has other rated descriptions such as 310 Wp, 320 Wp, etc.