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The Royale uses the DN50 12v to charge the House batteries driving the DN50 stay’s around 14.1 to 14,2 volts even after driving for hours, some others on the forum do the same. I was told that most regular motor homes like my Foretravel or Manaco’s have 1 alternator that charges both sets of batteries House and Chassis batteries so it can’t charge Lithium’s and Lead acid at the same time so you need a DC to DC charger to charge just the Lithium’s from the Lead Acid batteries. Where most of our buses at least Royale’s the House and Chassis batteries are totally separate they have 2 alternators so the 2 set’s of batteries charge differently. Everything I’ve read the Lithium need to charge at a little higher voltage if they are 12v they need to charge at 14.2v to 14.6v