Abstract
There exist over 2 GW of photovoltaic (PV) systems in the Czech Republic, exposed to moderate continental climate. Although there exist many PV modules defects, thanks to the generally the same production year 2009, only some of them are usual at systems installed in Czech Republic. This work shows delamination failures that are frequent in moderate climate conditions. Special account is taken into edge delamination defect and its possible propagation in modules of standard construction. Combined PV panel and PV inverter failure is caused by edge delamination with water penetration and high string voltage. The electric discharge channel is created between the string of solar panels and the grounded PV panel frames. The result of the discharge channel created because of edge delamination is inverter switch- off and few months later total destruction of the inverter because of protective relay damage. The number of combined PV panel and PV inverter failures is increasing substantially after ninth year of operation of PV panels in moderate climate. Additional sealing of the PV panel frames by transparent polysiloxane gel reduced the number of combined PV panel and PV inverter failures very substantially.
Highlights
T HERE is approximately 2 GWp of photovoltaic (PV) installed capacity in the Czech Republic
Similar PV panel, and subsequent PV inverter, damage, because of edge delamination effect occurs at majority of PV power plants older than ten years in the Czech Republic
Modules produced in Asia and the Czech Republic in the year 2009 installed in the Czech Republic were investigated
Summary
T HERE is approximately 2 GWp of photovoltaic (PV) installed capacity in the Czech Republic Such a large amount of standard design Glass/EVA/TPT aluminum framed c-Si modules represents a relatively good sample for evaluation of delamination defects at moderate climate. Some of them guarantee this decrease to be linear, the other ones have the performance limits typically after 10 (12) and 25 years of operation (rarely after 30 years). This warranty counts with the performance decrease caused by the common operation, which includes some types of defects like microcracks inside the cells that cannot be avoided. Namely the delamination defects in combination with water penetration of modules installed in the Czech Republic are presented
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