Evaluating Active Thermal Regulation in Polycrystalline Silicon Solar Cells Under Thermal Stress and Constant Irradiance
Naavya Garg
07/09/2026
This study examined whether a 3D-printed, microcontroller-controlled cooling system could recover the efficiency that polycrystalline silicon solar cells lose under thermal stress, while keeping irradiance fixed throughout. A single poly-Si cell was tested under three conditions: no cooling, a passive 3D-printed heat sink, and the same heat sink paired with an Arduino-controlled fan that switched on automatically once surface temperature reached 45°C. The study has demonstrated a relationship that is well established in theory but rarely shown directly with low-cost, accessible hardware: as a solar cell heats up, its voltage and power output fall predictably, and a simple active cooling system can partially counteract that fall.
Active cooling produced no statistically detectable advantage at moderate temperatures (60-70°C), however a significant one at the highest temperatures tested. At 70-80°C, the active-cooling condition delivered a mean power output 1.36 mW (roughly 3.9%) higher than passive cooling alone (Welch's t-test, p = 0.034). A corresponding voltage advantage of 0.26 V was observed in the same band. Within-trial autocorrelation means this voltage difference is reported descriptively rather than as a statistically confirmed effect. Therefore, the benefit appears where thermal stress is most severe. However, the fan's simple ON/OFF control could not bring temperature back below its activation threshold once heat was applied continuously, indicating that the system slowed overheating rather than reversing it.
At the single-cell scale tested, the fan's own power draw exceeds the power it recovers, so net energy gain is negative, and the case for practical viability rests on module-scale deployment. These results illustrate that the gap between a solar panel's rated performance and its output in hot climates does not require expensive infrastructure to begin closing. It is directly relevant to regions, such as South Asia and the Middle East, where low-cost polycrystalline silicon dominates.