I think you might be missing the point. The problem is your usage of power. With the air running, the engine fan runs continuously, as does the internal fan blowing cold air. Your power steering is using power. You have your headlights on then comes the killer, those lightbars. How many watts are your lightbars. Cheap ones are really inefficient. My guess is you could run one but three is waaaay to much. You are asking your UTV to power things like a car does. It is only a 1000cc motor (actually a little less). You should add a second battery and wire your light bars directly to the second battery, independent of the busbar. i know it is not the answer you want, but otherwise run a generator in the bed and power the lightbars with it.