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Remember that the voltage is going to be affected by the state of charge of your battery. Try to feed 85A into a fairly dead battery, you might not get much more than 12V. But try to feed 85A into a nearly full battery, and you'll get way more than 15V (and a few fried electronics too.) There's no way to control both voltage and current at the same time.
But still, 85A at 12V to 13V isn't that far away from 85A at 15V. You do need some sort of voltage protection that can throttle back the current so you don't go over 15V. Also the bigger the battery the better.
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