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As the Indian solar market expands, maintaining optimal PV module cooling has become a critical focus for developers aiming to maximize energy yield in high-ambient-temperature regions. Excessive heat significantly degrades the performance of polycrystalline solar panels. Recent experimental research conducted in Kalaburagi, Karnataka, provides a comparative analysis of two distinct thermal management strategies: passive aluminum fins and active copper oxide (CuO)-water nanofluid circulation.
The study utilized two identical 100 W polycrystalline PV panels, each with a surface area of 0.67 m². The modules featured an open-circuit voltage of 21.9 V and a maximum-power-point voltage of 18.1 V. The active cooling system employed a closed-loop setup circulating a 3 wt% CuO-water nanofluid at 2 L/min, powered by a 12 V, 0.5 A DC pump. This system utilized a 1 mm-thick copper plate with 8.53 m of copper tubing welded in a serpentine arrangement.
Conversely, the passive system utilized eight longitudinal aluminum fins attached to the rear surface using heat-sink paste. These fins, ranging from 0.80 m to 0.92 m in length, facilitated heat dissipation through natural convection, requiring no external power. Testing occurred on December 23, 2025, with irradiance peaking at 705.4 W/m².
The results indicated that the CuO nanofluid system maintained an average temperature of 32.5 C, significantly lower than the 44.7 C recorded for the aluminum-finned panel. Consequently, the nanofluid-cooled panel achieved a gross average power output of 91 W, compared to 85 W for the passive system. However, when accounting for the auxiliary power consumption of the DC pump, the net electrical efficiency of the active system was comparable to the passive aluminum fin method. For EPC contractors, this highlights that while active cooling offers superior thermal regulation, the parasitic load of pumping systems may offset the gains in net energy output.
The study concludes that under the hot and dry climatic conditions typical of many Indian solar project sites, passive aluminum fin cooling offers a robust, maintenance-free solution for thermal management. As the India renewable energy sector continues to scale, integrating such passive cooling technologies could prove vital for improving the long-term bankability and performance ratios of utility-scale and commercial rooftop installations, particularly in regions where ambient temperatures frequently exceed 40 C.
Aditya Pathre is the Founder of MVApulse and covers India’s renewable energy sector, including solar, wind, battery energy storage systems (BESS), green hydrogen, transmission infrastructure, renewable energy policy and competitive bidding. His reporting focuses on project developments, market trends, government policies and energy transition across India.
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