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Our recommendation for maximising performance: keep modules in their temperature sweet spot. Recent TÜV tests with TOPCon and advanced back contact technologies show just how much this matters.
Since the earliest days of crystalline silicon solar technology, temperature control has been recognised as a crucial factor in maximising both the performance and lifespan of photovoltaic modules. As module efficiency has improved and system voltages have increased, managing heat has become even more important, especially under real-world conditions such as partial shading or high ambient temperatures.
Longi pushes HIBC efficiency to nearly 28 percent
In 2012, the National Renewable Energy Laboratory (NREL) found that every 10 °C rise in operating temperature can reduce module efficiency by 3–5 percent, and raise the risk of long-term performance loss due to potential-induced degradation (PID) and thermal stress.
More recently, independent testing by German standards body TÜV Rheinland has shown just how much module temperature affects energy yield and reliability. Comparative tests found TOPCon modules reaching over 160 °C under shading, while LONGi’s HPBC 2.0 modules peaked at around 100 °C. This significant 60-degree difference lowers the risk of hot spots and degradation, and helps preserve power output. The net result is reduced energy loss, greater safety and improved long-term returns.
Leon Zhang of LONGi Europe on the evolution of LCOE (interview)
These findings are especially relevant, as shading remains a persistent challenge for the PV sector. Everyday issues such as dust, leaves, snow or bird droppings can create localised hot spots, accelerating wear and fire risk. Advanced module designs are addressing this directly. LONGi’s HPBC 2.0 “weak conduction” approach lets current bypass shaded cells internally, reducing power loss without activating bypass diodes. Importantly, field and real-world tests confirm measurable gains in both yield and cost savings.
Longi – a road map to ongoing innovation (video)
For commercial and industrial operators, the message is clear: keeping modules cool avoids technical failures and, equally as importantly, helps systems deliver more power and greater value over time. The good news is that the latest module technologies manage heat more effectively, setting new benchmarks for reliability and value in the PV sector. (TF)
More on the LONGi module certification here.
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