Cowboy Steak and Pepper Kebabs

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2 tablespoons unsalted butter, melted

2 tablespoons light brown sugar 

1 tablespoon chili powder 

2 teaspoons cumin

1 teaspoon finely grated orange zest

Kosher salt and freshly ground pepper

1 1/2 pounds beef tri-tip, cut into 1 1/2-inch cubes 

1 large sweet onion, cut into 1 1/2 to 2-inch dice

12 assorted color baby bell peppers, cored and halved 

Vegetable oil, for grill