Meter is a unit of length of the metric system and is the length of the basic unit of international unit system (SI).
As a basic unit of length of SI and other m.k.s systems (based on meters, kilograms, and seconds), meters are used to derive other measurement units such as Newton for power.
(*) 1 square meter is not exactly 10 square feet, 1 square meter is exactly 10.7639104 square feet. For simplicity we assume that the calculation is 10 feet per 0.1 kWp. Since each system and each roof are different, the actual area covered by the PV system will vary depending on the size, shape, type and location of the roof. It is a convenient approximation of 1 square meter per 0.10 kWp or 10 feet per foot. Knowing how much energy a roof or floor area can produce, you can calculate the amount of income it can produce. Simply multiply the annual energy production by the energy price. Example using Malta: 24,966 kWh x 0.16 EUR / kWh = 3,994 EUR. For over 20 years, this is 79,891 euros. Assuming the cost of solar power generation system to be 2,300 euro / kWp, the installation cost will be 34,500 euros. Therefore, a space of 150 square meters is worth. In this case, profit of € 45,391 or income of € 79,891
Suppose you have a roof space of x square meters (or y square feet). I think that about 1 square meter or 10 square feet * is necessary to install a solar power generation system of about 0.10 kWp. Or, to install a 1 kWp system, you need about 10 square meters or 100 square feet of space. Maximum possible system size and maximum energy output can also be calculated. To get the peak capacity of the system, divide the size of the roof by 10 square feet or 100 square feet. Next, multiply the result by the annual power generated by each peak capacity. (*) 1 square meter is not exactly 10 square feet, 1 square meter is exactly 10.7639104 square feet. For simplicity we assume that the calculation is 10 feet per 0.1 kWp. Since each system and each roof are different, the actual area covered by the PV system will vary depending on the size, shape, type and location of the roof. Convenient approximation of 1 square meter per 0.10 kWp or 10 feet per foot