NP Dale good luck with the set up.? I'd recommend trying different locations/angles and measuring the output voltage/current to see what works best.
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Other than the efficiency I find that using separate strings in series works pretty well.? I usually put one set on my front deck and the other on the boom.??
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Most of my sailing is week night racing with some weekend day sailing so I'm only charging the batteries 7-8 times/summer.? It usually takes around 5 days to bring it to a full charge from 60%.