The converter isn't meant to charge from that deep a discharge - to it it would appear no battery is present...
I expect the alternator from the engine would have worked if given enough time - certainly would need more than a few minutes.
I do carry an independent battery charger in my coach - just in case...
Had to use it on my previous rig when I had an alternator/wiring issue - and drained the chassis battery while traveling.
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Greg
Not yet retired...
Florida (Michigan transplant)
2014 Hurricane 32A
2000 Infinity (previous)
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