[RE-wrenches] Shedding ice

[benn kilburn]

boB,If this concept were to become a working option for the Classic, would the modules have to be modified in any way?  Why are the diodes not blocking the reverse current?benn

DayStar Renewable Energy Inc. benn at daystarsolar.ca780-906-7807 HAVE A SUNNY DAY





Date: Mon, 16 Jan 2012 13:14:36 -0800
From: boB at midnitesolar.com
To: re-wrenches at lists.re-wrenches.org
Subject: Re: [RE-wrenches] Shedding ice


  


    
  
  
    On 1/16/2012 11:39 AM, David Katz wrote:
    
      
      
      


        
          
            
              


              
              Mark,

                I believe the Midnite Classic has this feature built in.
                Check with them.

                David Katz

               

            
    

    

    It just snowed up here in Arlington, Washington A.C.  and we were
    just starting to melt some snow

    on a couple of modules on our roof just now with one of our charge
    controllers here in the lab.

    

    This feature is not yet in the Classic, BUT, check out this
    experiment that I did about 3 years ago

    in my front yard with an animated gif time lapse.

    

    One module is being powered and the other is not powered, just
    sitting there for comparison.

    These are KC125s.

    

    The time involved here was about 3 hours and took about 1 kW-hour of
    energy but gives you

    an idea of what may be done with this idea.  One thing not in our
    favor here is that the module

    that is being powered is resting on the ground, in the snow, which
    would significantly

    hinder snow melting I would think rather than being properly
    mounted.

    

    Oh what fun it is to melt some PV snow tonight !

    

    http://fusion.midnitesolar.com/PVsnowMelt3.gif

    

    boB

    

    

    

    

    

    

    

    

    
              
                From:
                  Mark Dickson [mailto:Mark at OasisMontana.com]
                  

                  Sent: Monday, January 16, 2012 10:00 AM

                  To: 'RE-wrenches'
                  <re-wrenches at lists.re-wrenches.org>
                  

                  Subject: [RE-wrenches] Shedding ice
                  

                 

              
              
                I recall a
                      conversation a while back about
                      the possibility of “reversing” the current in a
                      solar module to
                      increase the cell temp enough to shed ice/rime.
                       To follow-up, has anybody
                      been successful at this?  I am guessing, if so, it
                      would entail, removal
                      of diodes, increasing PV and battery capacity and
                      some way to sense the ice at
                      the very least. . . It sounds good in theory, but
                      I am skeptical as to whether
                      it will work in reality. . .
                 
                
                  Best regards,
                   
                  Mark Dickson,
                  NABCEP
                        Certified Solar PV Installer
                        ™
                  Oasis Montana
                        Inc.
                
                 

                
              
            
    

  


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