In many cases, oversizing the inverter, i.e. having more DC power than the inverter AC power, may increase power output in lower light conditions, thus allowing the installation of a smaller inverter for a given DC array, or alternately, installation of more DC power for a given inverter.

What is oversizing on a solar inverter?

As we mentioned further up, oversizing solar inverters refers to when you install a solar array (that's a group of solar panels) with a higher capacity than the rated size of your inverter. Basically, you install more solar panels that your solar inverter capacity is meant to handle.

What is a good DC AC ratio?

A healthy design will typically have a DC/AC ratio of 1.25. The reason for this is that about less than 1% of the energy produced by the PV array throughout its life will be at a power above 80% capacity. Thus a 9 kW PV array paired with a 7.6 kW AC inverter would have an ideal DC/AC ratio with minimal power loss.