The degradation seems to be quite slow in practice. Below 0.5% per year, i.e. less than 15% after 25 years.
> on average 850kw per year (again, looked it up online, if you have better figures, please!)
I think the number is closer to 900-1000kWh per year for Central Europe and 1200KWh/year for Southern Europe and California, but I don't know whether the higher average temperature at those places increases aging.
> This means you need to run your panel for 4 years
The degradation seems to be quite slow in practice. Below 0.5% per year, i.e. less than 15% after 25 years.
> on average 850kw per year (again, looked it up online, if you have better figures, please!)
I think the number is closer to 900-1000kWh per year for Central Europe and 1200KWh/year for Southern Europe and California, but I don't know whether the higher average temperature at those places increases aging.
> This means you need to run your panel for 4 years
Sounds good to me?