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So you are running them in series to get 18 volts because you want to charge the battery with it right?
Do you know if you can get away with less volts, say 14 volts, and wire the rest in parallel to raise the amperage that goes to the batteries and effectively make the solar cells more efficient? (14V x 16I = 224W) <--- assuming each cell produces 2 amps and you have 8 left over since your only using 14v instead of 18v... right?
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