Many people think DC/AC ratios of 1.1 are ideal, with 1.2 as slightly aggressive. We at Folsom Labs have found that many designers are overly conservative when thinking about DC/AC ratios. The key driver here is the “clipping loss”: when the DC power feeding an inverter is more than the inverter can handle, the resulting power is “clipped” and lost. For example, a 6-kW DC array combined with a 5-kW AC rated inverter would have a DC/AC ratio of 1.2 (6 kW / 5 kW = 1.2). The DC to AC ratio (also known as the Inverter Load Ratio, or “ILR”) is an important parameter when designing a solar project. But far fewer designers and engineers understand what are the practical limits. We all know that the module rated power can be larger than the inverter rated power (within reason-inverters do have a max input current). Pop quiz: What happens if you pair 6 kW of modules with a 5-kW inverter? How much energy will be lost due to “clipping?” Read an updated story on solar inverter clipping from 2019 here. Global Solar Panel Manufacturing Locations.Global Inverter Manufacturing Locations.
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