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electrical:solar:shading [2020/03/17 16:25]
frater_secessus [reminder: how panels work] 		electrical:solar:shading [2022/08/06 15:18] (current)
frater_secessus [Partial shading]
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 ====== Partial shading ====== ====== Partial shading ======
  
-Partial shading can have surprisingly dramatic effects on [[electrical:solar:output|panel output]]. The weirdest part is that //partial// shading can have more devastating effects on output than //full shading// like heavy overcast or evenly shaded forest canopies.+Partial shading can have surprisingly dramatic effects on [[electrical:solar:output|panel output]]. Perhaps counterintuivitely, //partial// shading can have more devastating effects on output than //full shading// like heavy overcast or evenly shaded forest canopies.
  
 ===== reminder:  how panels work ===== ===== reminder:  how panels work =====
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 There is another approach, which is to **bring the shaded cells/strings back online by bringing the rest of the panel down to their level**.  It sounds counterproductive, but with MPPT controllers and in some higher-voltage series configurations (say Vmp is >=3x bank voltage) it works.   There is another approach, which is to **bring the shaded cells/strings back online by bringing the rest of the panel down to their level**.  It sounds counterproductive, but with MPPT controllers and in some higher-voltage series configurations (say Vmp is >=3x bank voltage) it works.  
  
-This occurs because the MPPT has a broader range of voltages to sweep and can find [[https://www.sciencedirect.com/science/article/abs/pii/S0960148113006952|other power peaks]] (panel voltages) that are **low enough to bring the shaded cells back online** but still **high enough to charge the battery bank**.  It's  not reality, but we can think of it as MPPT evenly "shading" the entire panel voltage-wise in order to get max juice from it in partial shade conditions.+This occurs because the MPPT has a broader range of voltages to sweep and can find [[https://www.sciencedirect.com/science/article/abs/pii/S0960148113006952|other power peaks]] (panel voltages) that are **low enough to bring the shaded cells back online** but still **high enough to charge the battery bank**.  It's  not reality, but we can think of it as MPPT evenly "shading" the entire panel voltage-wise in order to get max juice from it in partial shade conditions.((https://diysolarforum.com/threads/mppt-sizing.17947/post-208104))
  
 ===== examples ===== ===== examples =====
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   * [[https://www.youtube.com/watch?v=QzzB1i1w_kM|altE video on partial shading]]   * [[https://www.youtube.com/watch?v=QzzB1i1w_kM|altE video on partial shading]]
   * [[https://www.youtube.com/watch?v=ofo1HQyGG8s|wiring shaded panels]]   * [[https://www.youtube.com/watch?v=ofo1HQyGG8s|wiring shaded panels]]
 +  * [[https://www.rv.net/forum/index.cfm/fuseaction/thread/tid/28152689.cfm|Solar Panel Shadows and Bypass Diodes]]
electrical/solar/shading.1584476700.txt.gz ยท Last modified: 2020/10/11 19:48 (external edit)

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