Solar cell structural body, solar cell array and sunlight power generation system

Abstract

A solar cell structural body having a solar cell arranged on a concrete retaining body, such that part of a conductor portion of the solar cell contacts the concrete retaining body. The concrete retaining body includes a concrete prepared from a mixture which includes at least a cement, water, and an aggregate. The concrete has a resistivity in a range of from 9×10 3 to 120×10 3 Ω·cm. A solar cell array in which the solar cell structural body is used, and a sunlight power generation system in which the solar cell structural body is used.

1 . A solar cell structural body having a solar cell arranged on a concrete retaining body comprising a concrete prepared from a mixture comprising at least a cement, water and an aggregate, such that part of a conductor portion of said solar cell contacts said concrete retaining body, characterized in that said concrete has a resistivity in a range of from 9×10 3  to 120×10 3  Ω·cm.  
     
     
         2 . The solar cell structural body according to  claim 1 , wherein the water to cement ratio of said concrete upon the production thereof is less than 40% by weight.  
     
     
         3 . The solar cell structural body according to  claim 1 , wherein the mixing ratio of said aggregate to said cement is at least 1:4 by weight.  
     
     
         4 . The solar cell structural body according to  claim 1 , wherein said cement comprises a Portland cement or an alumina cement.  
     
     
         5 . The solar cell structural body according to  claim 1 , wherein said concrete retaining body comprises a concrete hardened in atmospheric air.  
     
     
         6 . The solar cell structural body according to  claim 1 , wherein said concrete retaining body serves as a back face member or a trestle for said solar cell.  
     
     
         7 . The solar cell structural body according to  claim 1 , wherein said concrete retaining body does not contain a reinforcement.  
     
     
         8 . The solar cell structural body according to  claim 1 , wherein said solar cell has two electrically conductive portions having a different polarity, one on the light receiving face side and the other on the non-light receiving face side.  
     
     
         9 . (Cancelled)  
     
     
         10 . A solar cell array having a plurality of solar cell structural bodies connected with each other in series connection, each of said plurality of solar cell structural bodies having a solar cell arranged on a concrete retaining body comprising a concrete prepared from a mixture comprising at least a cement, water and an aggregate, such that part of a conductor portion of said solar cell contacts said concrete retaining body, wherein said concrete has a resistivity in a range of from 9×10 3  to 120×10 3  Ω·cm.  
     
     
         11 . The solar cell array according to  claim 10 , wherein a positive electrode terminal or a negative electrode terminal of said solar cell array is electrically grounded.  
     
     
         12 . A sunlight power generation system having a connection body in which a plurality of solar cell structural bodies are electrically connected and said connection body has a positive electrode terminal and a negative electrode terminal which are connected to an inverter having a ground sensor accommodated therein, each of said plurality of solar cell structural bodies having a solar cell arranged on a concrete retaining body comprising a concrete prepared from a mixture comprising at least a cement, water and an aggregate, such that part of a conductor portion of said solar cell contacts said concrete retaining body, wherein said concrete has a resistivity in a range of from 9×10 3  to 120×10 3  Ω·cm.  
     
     
         13 . The sunlight power generation system according to  claim 12 , wherein each of said plurality of solar cell structural bodies has a ground current I leak  of less than 100 mA.