A compressor’s capacity is stated under specific test conditions like ISI (e.g. ISI conditions for air conditioning compressors is at 35°C ambient; 55°C condensing and 7.2°C evaporating temperatures. ISI conditions for refrigerator compressors are at 32°C ambient temperature; 55°C condensing and 23.3°C evaporating temperatures).
A compressor’s capacity will vary as per the load. To ascertain compressor capacity, one needs to note the conditions it is operating at and state readings for comparison suitable for the specific compressor and refrigerant.