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View Diary: Let's put 'solar panels on every home' say Robert Kennedy Jr. and David Crane (190 comments)

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  •  Traditional hydro is done. (6+ / 0-)

    We've built out capacity.  

    There aren't any more great sites left.

    Maybe, someday, we can start taking the dams down.  For now, that'll be the last thing we get rid off.

    This place needs a PVP server.

    by JesseCW on Sun Dec 16, 2012 at 07:03:38 AM PST

    [ Parent ]

    •  How about micro hydro turbines in roof downspouts (1+ / 0-)
      Recommended by:
      GayHillbilly

      for exceptionally rainy areas?  Very intermittent, I understand, but hey, there are always ways to squeeze blood from a stone.

      Gentlemen, you can't fight in here! This is the War Room!

      by bigtimecynic on Sun Dec 16, 2012 at 11:04:33 AM PST

      [ Parent ]

      •  Not enough energy (3+ / 0-)
        Recommended by:
        2thanks, doc2, JesseCW

        You could put micro hydro in downspouts but it's such a minuscule amount of energy even WHEN it is raining, it's not worth the expense.

        If you google downspout hydro you'll see some experiments people have tried.  Here's a pretty thorough one:
        http://www.slideserve.com/...

        I think his math is a little off though. Or mine is...

        Let me see if I'm boiling down the results correctly

        A 2500 square foot roof top will collect roughly 20,000 gallons of rain water per year.

        It takes roughly 6 liters of water per second to produce 1 watt of power (using a computer fan). To produce 1 watt-minute thats 60 * 6 or 360 liters of water. To produce 1 watt-hour is 360 * 60 or 21,600 liters.

        From what I'm reading of those results that means a 2500 sq foot roof ultimately produces about 1-watt-hour of electricity per year. Not very much. If my math is wrong, please correct me.

        It's time for cheaper solar power! Zenman Energy

        by ZenManProject on Sun Dec 16, 2012 at 11:43:57 AM PST

        [ Parent ]

        •  So... microturbines at storm sewers outfalls? (0+ / 0-)

          Gentlemen, you can't fight in here! This is the War Room!

          by bigtimecynic on Mon Dec 17, 2012 at 05:28:34 AM PST

          [ Parent ]

          •  I like that (0+ / 0-)

            Not having stepped foot inside of a sewer I have no idea if that would cause any problems or how much energy it would ultimately produce, but it certainly sounds like a fairly simple idea.

            I have seen rainwater drains that spill into river and oceans. After a heavy rainfall those drains spew water out of them continuously for quite some time.  Maybe some sort of attachment at that point is the right location?

            It's time for cheaper solar power! Zenman Energy

            by ZenManProject on Mon Dec 17, 2012 at 06:43:31 AM PST

            [ Parent ]

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