You are stupid as hell.. a battery is far more efficient and will hold far more energy than any cap will ever hold. And if you take the alt out of the equation, you are going to run out of energy just as fast with a cap as you will with no cap. You are a moron if you think a cap drains less fast than a battery. It's very simple. The amp is going to pull say 50 amps, regardless of if there is or isn't an alt.
I don't see how you think a cap is less dependent on an alt than a battery bank is. Actually, I do, you are a moron and you think that because the cap is draining the battery it is less dependent on the alt. Well the battery depends on the alt, so if the cap depends on the battery, which let me remind you, runs on the alt, then the cap still depends on the alt.