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Mike, relative to the DN50 and Li battery bank, I had a big issue with installing a DC-DC charger. The DN50 regulator would not output power as it did not see a 12v “sink”. The charger essentially hides the Li bank from the regulator. I was told I would need some sort of battery connected to the alternator side of the charger (like chassis batteries in a 12v motorhome)
I called Victron in Germany and Lithionics and both confirmed the issue. Apparently the devices that would work were not yet updated to handle Li batteries. That was 2 years ago.
Would love to hear if a product now exists.