Reduced real lifetime of PV panels – Economic consequences.

• The lifetime of PV power plants does not reach the expected 20–25 years. • Data monitoring from 85 PV power plants in central Europe is used. • The real lifetime of PV power plants is about half the planned time. After 10 years of operation the frequency of serious failures rises sharply. • The examples of delamination, the formation of a conductive channel between the electrode and the grounded frame of the PV panels are demonstrated, the number of damaged inverters is analysed. • To calculate the economic efficiency of investments in PV power plants, the methods: payback period (PP), net present value (NPV), and internal rate of return (IRR) were used. The maintenance and analyzing failures of PV systems and plants are becoming more and more important issues. Our data from the long-term operation of 85 photovoltaic power plants in central Europe show that their actual lifetime is about half that of the originally planned lifetime. After about 10 years, serious failures of 1st tier (bankable) PV panels occur at an increasing rate. This article presents selected typical data and describes the most serious failures. Furthermore, economic calculations of returns on investment are carried out in relation to the price of electricity, which is currently changing at a rapid pace. It shows that the PV panel lifetime reduction from 20 to 30 years, declared at commercial leaflets, to real lifetime about 10–12 years can reduce PV power plant profit substantially, but the investment is still worth it. The reason is that after 10–12 years ser vice/maintenance expenses to replace damaged PV panels and inverters are growing very quickly. The new information could be helpful for owners of PV power plants to get a more realistic estimation of profits. [ABSTRACT FROM AUTHOR]