Oversizing Solar System, Inverter over sizing, Why You Should Oversize Your PV Array

Oversizing Solar System, Inverter over sizing, Why You Should Oversize Your PV Array
Oversizing Solar System, Inverter over sizing, Why You Should Oversize Your PV Array

Installing rooftop solar systems with a total panel capacity greater than the inverter capacity is usually a very good idea. The first and most important issue to remember is that for example the rating of our 3,000 W solar panels is a peak, or instantaneous, rating. Solar panels produce different amounts of power depending on their orientation and angle towards the sun, their temperature, the density of the air, and so on.
It is very common for the total capacity of solar panels in an array to be the same as the capacity of the inverter. This has the advantage that energy will never, or almost never, be lost because of the panels producing more power than the inverter can use. But this is not much of an advantage.
ou may decide you want to oversize your panels as much as you can and still receive STCs and make their total capacity exactly 133% larger than your inverter. But in practice this will often be hard to achieve because the capacity of individual solar panels is a fixed number. For example, if you have a 3 kilowatt inverter and you want to oversize your panels by 133% to 4 kilowatts and you are using 270 watt panels, the closest you will be able to get is 14 panels totaling 3.78 kilowatts. You can’t get any closer as adding one more panel will take you over the 133% limit.