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m →{{anchor|Watt-peak AC}} Conversion from DC to AC: clean up, replaced: |website = http://www. → |website= |
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The downrating of peak power and the related clipping is different from the losses incurred in the conversion from DC to AC, which happen at any power level and are usually relatively small.
Most countries refer to installed nominal [[nameplate capacity]] of PV systems and panels by counting [[Direct current|DC]] power in watt-peak, denoted as W<sub>p</sub>,<ref name=epia-2014>{{cite web |title = Global Market Outlook for Photovoltaics 2014-2018 |url = http://www.epia.org/fileadmin/user_upload/Publications/EPIA_Global_Market_Outlook_for_Photovoltaics_2014-2018_-_Medium_Res.pdf |website=epia.org |publisher = EPIA - European Photovoltaic Industry Association |access-date = 12 June 2014 |archive-url = https://
Some grid regulations may limit the AC output of a PV system to as little as 70% of its nominal DC peak power (Germany). Because of these two different metrics, international organizations need to reconvert official domestic figures from the above-mentioned countries back to the raw DC output in order to report coherent global PV-deployment in watt-peak.<ref name="iea-pvps-snapshot-1992-2014">
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In order to clarify whether the nominal power output (watt-peak, W<sub>p</sub>) is in fact DC or already converted into AC, it is sometimes explicitly denoted as MW<sub>DC</sub> and MW<sub>AC</sub> or kW<sub>DC</sub> and kW<sub>AC</sub>. The converted W<sub>AC</sub> is also often written as "MW (AC)", "MWac" or "MWAC". Just as for W<sub>p</sub>, these units are non [[SI]]-compliant but widely used. In California, for example, where the rated capacity is given in MW<sub>AC</sub>, a downrating of 15 percent in the conversion from DC to AC is assumed.<ref name="Gipe-DC-AC-conversion">{{cite web|url=http://www.wind-works.org/cms/index.php?id=38&tx_ttnews%5Btt_news%5D=208&cHash=bebbcb4dacd986e38d771a9bd496bdfb|title=Solar PV DC Conversion Factor for AC kW|last1=Gipe|first1=Paul|date=20 November 2009|website=Wind Works|archive-url=https://
== Cost per watt ==
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