Solar photovoltaic (PV) energy is a crucial supply technology in the envisioned renewable energy system. With enormous amounts of PV modules being installed, some will be affected by early-life failur.
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Unfortunately, glass-glass PV modules are, similar to regular PV modules, subject to early life failures. A failure of growing concern are defects in the glass layer (s) of PV modules. The scale of decommissioned PV modules with glass defects will increase with the development of solar PV energy [ 7 ].
2.2. Glass characteristics Glass-glass PV modules generally use 2–3 mm thick glass layers, since thicker glass layers negatively impact the module's weight and costs, while trends are to reduce glass thickness to below 2 mm [ 10 ].
The relative amount of glass defects ranges from several percent up to one of the most prominent failures of registered PV failures. A customer complaints research, on PV modules after two years of operation, observed glass breakage for 10% of the failure cases [ 28 ].
Glass-glass PV modules currently account for about 15% market share in the PV industry. Nonetheless, these glass-glass designs are predicted to represent up to 50% of the PV market in 2030 [ 10 ]. Glass-glass PV modules have a more durable design and higher mechanical strength [ 11 ].
Glass defects in PV modules refer to cracked or broken glass layers that are caused by human factors or extreme weather such as hailstorms and high wind- or snow loads [ 21 ]. The majority of the glass defects arise due to human force during installation, maintenance and primarily during on-site transportation of the PV modules [ 22 ].
The double-glass PV specimen has an invested energy of 1633 kWh/per module (986 kWh/m 2) [ 63 ], whereas the invested energy for the glass repair resin is calculated at 1.51 kWh/per module reparation [ 63 ]. Obviously, the do-nothing alternative does not require any energy investments.
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