1. Hi Dee,
      My main reasoning was never about the number of panels, but about getting as much Amps or Watts from the solar cells on the roof. That is partially about efficiency of the solar cells, but mainly about optimal use of the roof space.
      The length of these 135W panels, is virtually the same as the width of the roof. That worked out to three panels without any unused roof space. I found that any other combination of 100W/150W panels worked out to less than the total of 405W, that I have right now.
      FYI I did not consider rigid panels for ‘stealth’ purposes; their sizes may offer more possibilities.

      Van Williams

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