Marinate wings in 1 cup of vinegar for an hour at room temperature.
Saute onion and garlic in the butter for a few minutes.
Over medium heat stir in orange juice, honey, and ½ cup of vinegar.
Bring to a boil, then reduce heat and simmer for 10 minutes, stirring occasionally.
Refrigerate sauce to thicken.
Remove wings from the marinade, pat dry, then sprinkle with salt, pepper, and chili powder.
Place wings on bbq preheated to medium.
Grill for approximately 20 minutes, basting with orange sauce.