PVEL的湿热(DH)测试模拟了在高温和高湿条件下典型的长期退化和故障模式，在这种情况下，水分和热量会削弱将光伏组件结合在一起的材料。 当这些材料的粘性因低质量的部件和/或不合格的层压工艺而减弱时，水分会进入层压板并腐蚀内部材料。 其结果是潜在的性能损失和安全问题。
1.3% median degradation. 1.5% average degradation.
DH results showed a notable improvement, with 72% of BOMs exhibiting less than 2% degradation versus only 50% in the 2022 Scorecard.
1.0% median degradation for glass//glass versus 1.9% for glass//backsheet.
Further, in all three cases when manufacturers submitted glass//backsheet and glass//glass BOMs with identical cells, the glass//backsheet degradation was greater than glass//glass, and in one case it was almost four times higher.
Average degradation was 1.2 to 1.7% across CdTe, HJT, PERC and TOPCon.
No technology-specific outliers were seen in DH results. Additionally, none of the Top Performers listed required BO stabilization, compared with 70% and 23% in the 2021 and 2022 Scorecards, respectively. This was largely due to the evolution to gallium-doped PERC and n-type technologies.
DH-related power loss failures drop to zero.
The 2022 Scorecard reported 4% of BOMs having a DH-related power loss failure. That dropped to 0% this year. Meanwhile four manufacturers had DH-related failures ranging from connector issues to insufficient insulation resistance.