Research, Application and Development Trend of Bifacial Double-glass Module-Trina Solar

© 2017 Trina Solar. All rights reserved. CONFIDENTIAL. 1 Bifacial Dual-Glass Module Related Studies, Applications anomalous expansion(0℃800w/m2，shaded time period: kept for 3h.Ø Module grid face is upward, temp at the grid node on battery chip showed almost no difference to other areas. In normal installation, the grid face is downward, even more impossible to cause temp difference. 3.4 Study on dual-face/dual-glass hot spot of grid white glass © 2017 Trina Solar. All rights reserved. CONFIDENTIAL. 24 Ø Backsheet ageing performance comparisonUV yellowing, HT yellowing and abrasion issues also affect on long term ageing performance of backsheet module, resulting in drop of light transmitance and hence the power output. 3.5 Performance dference of transparent backsheet VS glass Ø Difference in light transmission: Light transmittance of transparent backsheet is 88% at 400~1100nm wave length band, lower than 91.2% of super white fured glass, this may result in ~3% back-face power rate difference. The table below is a calculation on the basis of 360W power rate (70% dual-face rate): Parameter Dual-glass (91%) Transparent backsheet (new, 88%) Transparent backsheet (aged, 70%)Power rate (front) 360WPower rate (back) 234 227 180Dual-face rate 65% 63% 50%Power gain (sand land) 11.2% 10.6% 8.5%Under UV irradiation, ageing activated energy of PET material is around 100~150kJ/mol, i.e. ageing rate will be tripled by each 5℃ temp increase. © 2017 Trina Solar. All rights reserved. CONFIDENTIAL. 25 Table of Content1. Dual-glass reliability theoretical analysis ü Module：increased copper wires also resulting in lower resistance GlassEVAWireMBB Solar CellGlassEVASolar Cell Flat Ribbon MBB ModuleConventional 3 ~5 BB Module © 2017 Trina Solar. All rights reserved. CONFIDENTIAL. 28 高 功 率 高效 率 更 低 成 本空 间技 术 兼 容性 高更 美 观更 高 可 靠性MBB product features l Battery endl Module endl Totalized Q3MBB5BB l Battery efficiency +0.2%, l Power rate +6~10W l With the same size, efficiency +0.35%l Can be combined with the complete series of single-face, dual-face, mono-/dula-glass products l By integrating with half-chip，the generalized power rate can be increased by 4% or morel Aesthetic module design bulk production orders cover mono-/poly-chip, mono-/dual-glass, and 60/72pcs products n For 60pcs battery chip module, common poly-chip module can increase power by at least 6W, for Perc mono-chip module, power rate can increase by 8W or moren Dual-face MBB module enjoys higher advantages in more aspects © 2017 Trina Solar. All rights reserved. CONFIDENTIAL. 30