I asked this same question on another forum a few months ago. This is what I learned.
Your vehicle alternator is more of a battery maintainer than a battery charger.
Your coach converter is a battery charger. Your alternator amperage output is low at idle rpm. It is higher at cruising rpm.
Your converter is designed to charge banks of batteries. Your Sears charger is designed for a single battery.
Some find it handy to use a 2000 watt inverter generator to power the converter. This is quieter and uses less fuel.
So many options.
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Shawn
2017 Windsport 35M
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