Since most solar pumping systems do not include battery storage backup, and sunlight intensity fluctuates throughout the day, we typically design the solar array to be 1.3 to 1.5 times the capacity of the AC pump. In this case, we use a factor of 1.4 for the calculation for a 11kW AC Pump:
1.4 × 11 kW = 15.4 kW.
This means that for an 11 kW AC pump, we require approximately 15.4 kW of solar panels.
When performing the system design, we must consider two key technical factors:
The solar pump inverter's input specifications, including the maximum solar input voltage and MPPT voltage range

The solar panel specifications, such as power rating, maximum power voltage (Vmp), and open circuit voltage (Voc). For this design, we are using
550 W monocrystalline solar panels.

To achieve 15.4 kW, we need:
15,400 W ÷ 550 W = 28 panels.
Given that the inverter's MPPT voltage range is 480–850 V, we can arrange the 28 panels in two parallel strings of 14 panels in series.
Each string will have an open circuit voltage of 14 × 50.2 V = 702.8 V, which is below the maximum limit of 880 V.
The working voltage (Vmp) will be 14 × 42.4 V = 593.6 V, which falls well within the MPPT range and close to 600V, working voltage 600V is best for system performence.
In summary, for an 11 kW AC pump, we will use 28 × 550 W = 15,400 W of solar panels, equivalent to 15.4 kW.