the "Instant Pot Duo Evo Plus Pressure Cooker 9-in-1" model does not have a specific low-pressure slow cooking mode that operates at a constant wattage of 300 watts, and then throttles back to around 100 watts over an extended period of 8 to 10 hours.
The Instant Pot Duo Evo Plus is primarily known for its pressure cooking capabilities and versatility in performing various cooking functions such as pressure cooking, slow cooking, rice cooking, sautéing, and more. It offers different settings for slow cooking, but it may not have the specific power throttling feature you described.
Power consumption and settings can vary between different Instant Pot models and their firmware versions. To get the most accurate and up-to-date information about the specific features and power consumption of the "Instant Pot Duo Evo Plus Pressure Cooker 9-in-1," I recommend referring to the product's official user manual or contacting the manufacturer directly.
Keep in mind that while many modern electric pressure cookers and multi-cookers are designed to be energy-efficient, continuous use of any appliance for extended periods can still contribute to your overall energy consumption. Always use appliances safely, follow the manufacturer's instructions, and never leave any cooking appliance unattended for extended periods, especially if it involves pressure cooking or slow cooking.