Applications of Liquid-Cooled Panels in the Photovoltaic Industry

1500V string/centralized inverters have become mainstream. Power devices such as IGBTs have high heat flux densities; for every 10°C increase in junction temperature, efficiency decreases by 1–2% and lifespan is halved. Outdoor applications require a 25-year lifespan, but air cooling is unreliable in high-temperature/dust environments.

• Material: 6061-T6 aluminum alloy (anodized + anti-corrosion coating), suitable for 25 years of outdoor corrosion resistance.
• Flow Channels: ≤100kW straight channel; 100–300kW microchannel; ≥200kW Pin-Fin (30% reduction in thermal resistance).
• Coolant: 25% ethylene glycol aqueous solution, stainless steel/nickel-plated piping, corrosion and leakage resistant.
• Thermal Resistance Control: IGBT junction temperature ≤60°C, 40–60% higher cooling efficiency than air cooling, significantly reduced failure rate.

Photovoltaic systems paired with energy storage are becoming standard. The optimal operating temperature for lithium batteries is 25–35℃; a temperature difference > 5℃ accelerates degradation and reduces consistency. High-power energy storage (≥50kW/cabinet) suffers from high energy consumption and uneven temperature control due to air cooling.

• Cooled Plate Liquid Cooling: The liquid cooling plate is attached to the bottom/side of the battery module. The coolant circulates and removes heat, controlling the temperature difference to ±2℃, reducing energy consumption by 30%+ compared to air cooling.
• Fully Liquid-Cooled PCS: The inverter IGBT and energy storage battery share the liquid cooling circuit, resulting in high system integration and excellent heat dissipation efficiency.