Slice kielbasa into 1" rounds then add to a 6 quart crock pot (could use a 4 or 5 quart as well.) Whisk sweet chili sauce and bbq sauce together in a bowl then add to crock pot and stir to combine. Cook on low for 3 hours or high for 1-1/2 - 2 hours, or until hot. Let crock pot sit with the lid off for 10-15 minutes after cooking to help sauce thicken up a bit.