The sun delivers 1360 watts of energy per square meter.
A good quality solar panel will produce electricity for 25 years.
Solar panels are maintenance free, only caution needed is not to smash or drop heavy things on the surface of solar panels.
The strength of the solar energy available depends on the time of year, the time of day, and the latitude of the generation point. The amount of energy generated can be further affected by the amount of dust and water vapors in the air, and the amount of cloud cover.
Yes you can increase your system’s capacity at any time.
Your total electrical demand (Load) can be calculated by your installer. You will need to provide them with information such as the number of lights, appliances etc. you wish to run off the solar system. You will need to state your average daily use which is listed in many electricity bills. The installer will then be able to calculate the kilowatt hours per day, or ampere hours per day, that the system will need to provide to generate complete supply.