We grill all year long here, but have never done brats. I would think you would do them just like you do any meat. I usually put them in a frying pan with a little water, and cook till done.
We will be cooking Brats for 20 people when the weather clears up - we have had to postpone it for over three weeks now!! We have a recipe for Beer Batter. I guess you can do it two ways - first, cook in the batter and then throw them on the grill - the other, grill first, batter last.
We finally had the party last month. Cooked outside, had the food inside. Did the batter first and grilled after. I guess they were good. I selected a hamburger instead because I looked up the calorie count for the Brats.