I have run my speakers all day and it has started up fine. This setup is nowhere near needing capacitors. That's when you run 3-4 subs. There really isn't a power problem as this is a simple and small system. The only other things you need are an install kit and a sub box.Would I neead a capacitor or anything else? Wouldn't that drain your battery? I like the setup bc it's cheap. But it may not be cheap if I have to add other things :/