Clipping

Updated 2026-08-24 · Read this page as Markdown

The loss that occurs when a PV array could produce more DC power than the inverter is able to convert, so the inverter holds its output at the AC limit and the surplus is simply never harvested. It appears on production graphs as a flat plateau around midday.

Clipping sounds wasteful but is usually an intentional and economically sound trade: the peak occurs for a short time on the clearest days, while the oversized array adds energy every morning and afternoon of the year. The important question is not whether a design clips, but how many kilowatt-hours a year it clips. Note that the inverter does not overload during clipping — it backs off along the array's I-V curve and runs cooler than a naive reading would suggest. Clipping losses grow quickly once the DC/AC ratio goes past the range appropriate for the climate.

Related terms

DC/AC Ratio (oversizing) The ratio between the array's rated DC capacity in watt-peak and the inverter's nominal AC power. A ratio above 1.0 means the array is deliberately oversized relative to the inverter, which is standard practice rather than a design error. Derating The automatic reduction of an inverter's output power to protect its internal components, most commonly triggered by high temperature but also by high grid voltage or by an out-of-range input. The unit keeps running at reduced capacity instead of shutting down. Power Optimiser A small DC-to-DC converter fitted to each module that performs maximum power point tracking at module level and conditions the module's output before it joins the string. The string then feeds a simplified central inverter that handles only the DC-to-AC conversion. Self-Consumption The share of the energy a PV system generates that is used on site rather than exported to the grid. It is the metric that most directly drives the economics of a residential installation, because avoided imports are usually worth more than exported units.

Clipping

Related terms

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