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How Oversizing of Solar Panel is done !

Why we should keep extra 10% of Solar Panel than the Solar Inverter Capacity?

If a 330Wp panel is producing at its rated peak output, around 25 Watts are wasted by the input limitations of the inverter.  So, if we are putting up a 5.8KW of Solar Inverter, then we may choose 21 Solar Panels of 330Wp each, thereby making overall wattage at DC side as 6.93KWp (119% of AC Side).


In real-world conditions, the panel rarely produces at its rated peak output.  There are two main reasons for that:-

A) Efficiency Loss: real world factors like Temperatures, Shading and Pollution affect the amount of light hitting the panel. This can cause the panel to produce below its rating.

B) Production Curve: The Solar Panel doesn’t produce a consistent amount of power throughout the day.  Power Produced follows a curve as a function of environmental factors and Sun Path.  For Peak Power Output, the Sun has to be angled so it is directly perpendicular to the Panel, allowing it to absorb the maximum amount of light possible.  As the sun moves across the sky, the angle changes so that less light strikes the panels. This causes the panels to produce less power.

The Direction & Tilt of the Solar Panel is very important for the maximum efficiency of the solar system, and hence it is directly important for the ROI of the investment.

The solar panels in India should be aligned towards South Direction, as long as it is possible.  This is due to the reason that our country is in the southern hemisphere.  So, when the sun travels, it takes an Elliptical Trajectory going from east to west having an inclination towards south.  Hence to get the maximum quantity of solar energy we have to place our panel accordingly.


As you can see, be it summer or winter, the inclination is towards south.

The Tilt Angle is determined according to the Latitude of the City. For example, Cochin in Kerala has got tilt angle of 10-12 degree. On the other hand tilt angle of Delhi is around 28- 30 degree.