Yep, voltage drop is a killer. I used a Victron calculator tool ages back on the boat and it was eye-opening—turned out I needed nearly double what I'd planned for my solar array run to the charge...
Got a Fogstar 100Ah LiFePO4 in the van and won't look back. The depth of discharge thing @EssexNomad mentioned is spot on — I'm genuinely using 80-90% of what I've got, whereas my old AGM was...
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