The solar panels can be soldered together in parallel series or both for the voltage amperage needed.
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A thin film solar panel are made by solar cells that have light absorbing layers and much smaller than a standard silicon panel which allows it to be light.
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Another poster submitted his solar project it documents how the panels were installed on his roof he had purchased 18 panels that were rated for 280 w of peace weighing in at 1 200 pounds costing 1700.
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The cost for each thin film sheet was about 17 usd and the wire was cheap speaker wire 24 gage.
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The thin film panels can be bought in various sizes too at about 12 volts you might consider a 12v solar panel to avoid all the soldering.