Yes, the size of the refrigerator has a direct impact on power consumption. For example, if you purchase a 5-star rated 260L refrigerator and compare it to a 5-star rated 180L refrigerator. The lower capacity refrigerator will consume between 70 and 80 units less power than the higher capacity one. It is also important to understand that the refrigerator provides full value for money when running at full capacity. So, understand your capabilities and carefully choose a model to save your money.