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Thanks - that's helpful

There is that yeah but I would assume (based on little experience or knowledge) that portability also compromises on efficiency/quality of panels. That's interesting you got 20% as a kind of minimum though

Thanks Geoff - yeah I'd expect that although hadn't thought it would be that small a % of rated output

Hi - I wonder if you can help me. I've been trying to figure out the optimal system for charging basically just a samsung tablet while bike touring through winter in UK. The system I calculated [see below] based on this guide (for 12v system) would involve maybe 2x 100w panels (or equivalent to...