There are several ways to improve the efficiency of your portable refrigerator: Pre-cool your fridge and its contents: Before your trip, cool the fridge using a 220V source and pre-chill or freeze your food and drinks. Use an insulated cover: This helps maintain the fridge's internal temperature and reduces the frequency of cooling cycles. Ventilation: Ensure proper ventilation around the fridge, especially around the cooling fan area, to prevent overheating. Keep it shaded: Park in the shade or use reflective materials to keep your fridge and vehicle cooler. Efficient packing: A fully stocked fridge maintains its temperature better than a half-empty one. Organize items efficiently and only introduce cool items into the fridge. Minimize door openings: Try to limit the number of times you open the fridge to prevent warm air from entering and causing the fridge to work harder to cool down.