Photovoltaic double glass module aluminum frame

ABSTRACT: Double-glass modules provide a heavy-duty solution for harsh environments with high temperature, high humidity or high UV conditions that usually impact the reliability of traditional solar modules with backsheet material.

The double glass module design offers not only much higher reliability and longer durability but also significant Balance of System cost savings by eliminating the aluminum frame of conventional modules and frame-grounding requirements. The application of double-glass modules covers multiple markets including utility, residential and commercial.

Double-glass PV modules are emerging as a technology which can deliver excellent performance and excellent durability at a competitive cost. In this paper a glass–glass module technology that uses liquid silicone encapsulation is described. The combination of the glass–glass structure and silicone is shown to lead to exceptional durability.

A frameless double-glass module and a traditional PV module with a 3.2mm glass with an aluminum frame were both qualified to withstand heavy accumulations of snow and ice under a high pressure of 5400Pa up to 6700Pa. modules are connected electrically in series until a maximum string voltage of 600 volt or 1,000 volt is achieved.

Recently several double-glass (also called glass–glass or dual-glass modules) c-Si PV modules have been launched on the market, many of them by major PV manufacturers. These modules use a sheet of tempered glass at the rear of the module instead of the conventional polymer-based backsheet. There are several reasons why this structure is appealing.

remedy most of the reliability issues in PV module design. The traditional backsheet materials of conventional solar modules was replaced with toughened (heat strengthened) 2.5 mm-thick glass. To reduce the weight of the module, the front glass thickness was also reduced to 2.5mm(Fig. 1).