Whilst that is true Ken, therein lies the rub. To go to the 22% most efficient commercially available cells costs, whereas going less efficient and therefore more area when considering watts per square metre output, it doesn't always make economic sense on a boat although it is desirable. When you do the numbers of capital cost v payback time if leaving boat on a mooring to recharge - you could be 25 years or more in comparison to plugging into a grid electricity source, subject to your latitude.
Note efficiencies are of the cells rather than panel area. If you work out panel area output per square meter it can bring up some surprising results, especially when using large single panels and taking cost and payback into account. A favourite panel for me would be the Norwegian Crystals Norwegian Crystals - Producer of high quality, cost efficient mono Si crystals in Norway
John R
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