Background for that question: I'm looking at Renogy 175Wp panels, with a weight of 6.2 pounds. Six of these would come to 1.05kWp and 37.2 pounds (before cabling, attaching, support structure, ...). With my battery weight cost currently at 16 pounds per kWh, I'd need to cruise for well over two hours before the panels make sense compared to just brining more battery. While we do frequently cruise that long, that calculation is assuming a full solar harvest, which is unlikely in the Pacific Northwest. So the real 'in practice' number is probably more like three-four hours. And with battery energy densities increasing beyond 180Wh/kg for LFP cells, that 16 pounds per kWh is more like 12 pounds per kWh, resulting in it making more sense to just bring more battery for all but the longest of cruises (over six hours). Note that an extended tie-up time at some destination swings the result back towards panels.
My use case differs from yours of course. I'm strictly about day cruises. With your multi-day cruises, you can much more easily justify the added weight of panels, because your harvest duration is much longer.
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