The DC-to-AC ratio, also known as the Array-to-Inverter Ratio, is the ratio of the installed DC capacity (solar panel wattage) to the inverter''s AC output capacity. A typical DC-to-AC ratio ranges from 1.1 to 1.3, with 1.2 being a common value
The DC-to-AC ratio — also known as Inverter Loading Ratio (ILR) — is defined as the ratio of installed DC capacity to the inverter''s AC power rating. It often makes sense to oversize a solar array, such that the DC-to-AC ratio is greater than 1 .
Note how rarely the array produces above 80% or 90% of the modules'' rated DC power. Because the PV array rarely produces power to its STC capacity, it is common practice and often economically advantageous to size the inverter to
Explanation of the oversizing ratio of the DC solar PV-to-inverter AC power output over a whole day. When there is enough sunlight, the PV array''s power output will exceed the inverter''s
