Add the chopped carrots, rinsed red lentils, diced onion, minced garlic, and grated ginger to the slow cooker.
Pour in the vegetable broth, coconut milk, turmeric, salt, and black pepper.
Stir everything together until the ingredients are evenly combined.
Cover and cook on low for 6 hours or on high for 3 hours, until the carrots and lentils are soft.
Use an immersion blender to puree the soup until smooth. If you do not have an immersion blender, carefully transfer the soup in batches to a regular blender.
Taste and adjust salt or pepper if needed.
Serve hot with fresh cilantro and lime wedges on the side.