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Some of that is lost due to regulatory 70% limits during peak times.

Also the rated capacity is for some synthetic sun conditions. I have no idea what's the conversion factor between ideal sun in Germany and the PV rating sun.

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Then there is the fact that many installations are explicitly using small converters, not all installations face the same way (east-west setups are a big thing for farms and other large scale setups). I live right next to Germany and getting 80% of your installed capacity is considered optimal.

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