Inverter clipping, or “inverter saturation,” occurs when DC power from a PV array exceeds an inverter’s maximum input rating. The inverter may adjust the DC voltage to reduce input power, increasing voltage and reducing DC current. Alternatively, the inverter may restrict or throttle the inverter’s AC output.
It is commonly assumed that cleaning photovoltaic (PV) modules is unnecessary when the inverter is undersized because clipping will suficiently mask the soiling losses. Clipping occurs when the inverter’s AC size is smaller than the overall modules’ DC capacity and leads to the conversion of only part of the PV-generated DC energy into AC.
The inverter may adjust the DC voltage to reduce input power, increasing voltage and reducing DC current. Alternatively, the inverter may restrict or throttle the inverter’s AC output. Inverter clipping is typically seen in PV systems that have high — for example, greater than 1.4:1 — DC/AC ratios. Why does it matter?
Left: Simulation of inverter clipping on 1kW DC fixed-tilt system in Broomfield, Colorado, on March 20, 2015. The following losses were considered: 10% DC losses (excluding soiling), 5% soiling losses, 5% inverter losses. The DC to AC ratio was set to 1.34. After clipping, soiling losses reduce the actual AC power by 2.3%.
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Inverter clipping, or “inverter saturation,” occurs when DC power from a PV array exceeds an inverter’s maximum input rating. The inverter may adjust the DC voltage to reduce …
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