Solar Inverters & Systems
What DC/AC ratio should I design for?
Reviewed by SolvSolar · Last reviewed:
Design for a DC/AC ratio of 1.1–1.3 in most rooftop systems. Oversizing the array relative to inverter capacity flattens the generation curve and raises annual yield, especially in cloudy or high-latitude sites. Above roughly 1.35, midday clipping losses start to outweigh the morning and evening gains, so the extra modules stop paying for themselves.