Great thread this. @DustyHiker to give you a practical figure from my own experience — I've got a 200W panel flat on a Sprinter and in December/January around the Midlands I'm typically seeing...
@RogerHobbs been in a very similar situation with a 300Ah lithium bank on my workshop setup. One thing worth considering is a proper battery-to-battery charger rather than just plugging the genny...
Good thread, this. One thing worth mentioning that I haven't seen raised yet — have you checked the quality of your BMS ground connection back to the negative busbar?
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