I ran into this exact problem last winter. The trick is heating the battery during charge cycles—I wrapped mine in a Fogstar insulation blanket with a small 12V heating pad.
Completely with you all on this one. I've taken to inverting my phone's display settings just to browse here after dark—absolute pain when you're trying to check battery voltages at 2am and don't...
Mate, this is exactly the sort of project I've been following closely. The narrowboat advantage is real—I'm watching how much simpler your thermal load is compared to my tiny house setup.
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