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Altitude correction factor for inverters


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I am asking about the altitude correction that has to be done to the inverters data in order to derate it for altitude in the program. For example, if the altitude of the installation is over 3500 m.a.s.l., the climatic data has to be changed and I understand the software takes care of it, but the inverter has to be derated also and I don't know if the software takes it in consideration or not. If not, what has to be done to the parameters of the inverter in order to comply with the manufacturer recommended values for derating.

Look forward for your hint.


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PVsyst doesn't take the altitude correction for inverters into account.

The correction - when necessary or specified by the manufacturers - is mainly related to cooling capabilities (air pressure) and results in a diminution of the Nominal outpout power.

If you want to take this into account, you have to redefine your inverter with a new Pnom corresponding to your altitude (i.e. change the value, and save your inverter under another file name).

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