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Energy losses due to the degradation of PV modules

Anthony Rossier

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I'd like to know how the energy losses are calculated over the years due to the degradation of the modules (in this case -20% after 25 years). When I check in the graph below, the energy production of the 1st year is 172'242.5 kWh (170'858.8 kWh for the 2nd year...). But when I check the energy balance (picture 2), the value of the energy sold is 172'958.53 kWh.

How is the first year of this graph calculated? Is it possible to find these values in a CSV file?

Thank you for your answer.





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Dear Anthony,

the degradation calculation is not directly part of the energy simulation in PV*SOL, but rather part of the economic calculations. So, in the energy balance you see the values without degradation of the module. In the diagram "Energy over observation period" you see the annual PV energy, reduced by the degradation. These figures serve as input for the economic calculations. We calculate the degradation on a monthly basis, so depending on the installation date of your system, it might happen that even in the first year there is a notable degradation, i.e you'll see a difference between the un-degraded energy balance and the first column of the degradation diagram.

You can copy all tables and diagrams by selecting and right-clicking them.

Hope that helps, kind regards,


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