Slow Cooker Vegan Sweet Potato Chili

2 sweet potatoes

peeled and chopped into 2-inch pieces

1 (15 ounce) can kidney beans

rinsed and drained

1 (14.5 ounce) can diced tomatoes

1 yellow onion

diced

1 red bell pepper

seeded and chopped

2 cloves garlic

minced

1 tablespoon chili powder

1 teaspoon smoked paprika

½ teaspoon Kosher salt

1 cup water

½ cup orange juice