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Victron 70A 24>12 converter:
https://www.amazon.com/gp/product/B01BF5BQLA/ref=ox_sc_act_title_10?smid=A21C4U5X700J66&psc=1
I leave my batteries on and the converter powered up (haven't shut it off since turning it on). It literally draws nothing unless there's a load on it, i.e. I can go out...
I have a 24 > 12 volt converter that I turned on a long time ago and haven't shut off. Basically zero draw on the system until it's used. I know it's using something but I can tell you empirically that it's right there next to nothing. There's very little downside to using it.