Steve, I have the 80amp Progressive Dynamics Converter/Charger. It takes pretty large gauge wire. I installed it over 3 years ago, and have had no problems. Has saved me a lot in new batteries....the old batter boiler was killing my batteries one at a time. Mine has the set screws. Personally, the "remanufactured description" does not bother me....if the guy has a 100% rating, then the odds are he is not putting bad products out there.
Obviously, the only time you need a charger is when you are plugged in, and relying upon that as a source to recharge your batteries.
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