In general, the amount of sunlight a solar panel receives in a day is expressed in terms of peak solar hours. It means how many hours of rated power the solar panel can deliver on an average day. For example, if we have a solar panel rated at 450W and the site has 4 hours of peak sunlight, this means that we can supply this solar panel with about 4x450=1800W hour of energy per day, or 1.8kWh. This is because the amount of electricity a solar panel can produce is directly proportional to the amount of solar energy it receives. So it is important that our solar panel is installed in a direction that collects most of the direct sunlight.
Your solar company is responsible for the design and installation of solar inverters in your solar system, and they will provide you with a calculation of how much energy your solar system will produce based on the available peak solar hour values, they will tell you how many kilowatt hours your solar system and converter will produce in your particular installation, it is important to ask them to provide you with this value in writing. Peak sunshine hours typically change throughout the year from summer to winter, and your installer will be aware of this so he will provide you with an estimate of energy production accordingly.
Peak insolation hours：
This term refers to the amount of sunlight (kWh/m2) received at a given location when the sun is at its maximum for a given period of time. Since the maximum solar radiation is 1kW/m2, then the peak solar hours would be the number corresponding to the average solar irradiation per day. For example, if we have an allocation that receives 6kWh/m2 a day, we can determine that it receives 6 solar hours per day at a solar radiation intensity of 1kW/m2. Therefore, it is important to calculate the peak insolation hours because the solar PV panels are always rated at 1Kw/m2 input power.