No. The presence of the heat exchanger on the backside of the panel has no impact on the backsheet’s durability.
Moreover, with a stagnation temperature of 80°C, the panel’s temperature also does not have an impact on the backsheet’s durability.
The Isovolta backsheet used for DualSun panels undergoes a temperature of 150°C during the lamination process and maintains all of its properties. Also, during certification testing, the DualSun panel underwent TC200 (thermal cycling with 200 cycles from -40°C to +85°C) and DH (humid heat: 85°C et 85%H), each test lasting approximately 1.5 months (1,000 hours).
Moreover, Isovolta has also validated 2,000 hours of DH without issues and indicates on their technical datasheet: “”Relative Temperature Index (RTI): 105°C”. The “Relative temperature index (RTI)” is the maximum service temperature at which the important properties of the material are not impacted by thermal-chemical degradation.