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opinion:solar:sizing.walkthrough [2022/05/27 14:38]
frater_secessus [where and when we are camping] 		opinion:solar:sizing.walkthrough [2022/05/27 14:39]
frater_secessus [panel wattage]
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 The good news is that different locations get roughly predictable average amounts of sunlight during specified months, and [[https://web.archive.org/web/20180811212703/http://www.solarinsolation.org/wp-content/uploads/2012/01/Solar_insolation.jpg|scientists have tabulated this data]]. The data is expressed in terms of hours of Full Sun Equivalent and assumes flat-mounted panels.  You can think of this as "hours of laboratory-perfect conditions".    The actual number of hours of sunlight in the day don't matter, nor do the average climatological conditions.  4 hours of FSE in Phoenix in summer might be 6.5 hours by the clock, while the same 4 hours of FSE in Anchorage might be 14 hours by the clock.  No matter.  The math works.   The good news is that different locations get roughly predictable average amounts of sunlight during specified months, and [[https://web.archive.org/web/20180811212703/http://www.solarinsolation.org/wp-content/uploads/2012/01/Solar_insolation.jpg|scientists have tabulated this data]]. The data is expressed in terms of hours of Full Sun Equivalent and assumes flat-mounted panels.  You can think of this as "hours of laboratory-perfect conditions".    The actual number of hours of sunlight in the day don't matter, nor do the average climatological conditions.  4 hours of FSE in Phoenix in summer might be 6.5 hours by the clock, while the same 4 hours of FSE in Anchorage might be 14 hours by the clock.  No matter.  The math works.  
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-Example:  if we need 2,317Wh and will be in an area with 4 hours of FSE in March, in theory we could get by with  
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-In practice 100% yield is not normal.  After various losses MPPT-equipped systems will get more like 85%, and PWM systems around 72%.((again, if you have observed your own system and know what it does then use the actual number)). For the purposes of this article we will call this //system efficiency//.  Examples: 
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-  * theoretical - 1,200Wh harvest 
-  * MPPT - 1,200Wh x 0.85 = 1,020Wh harvest 
-  * PWM - 1,200Wh x 0.72 = 864Wh harvest 
  
  
opinion/solar/sizing.walkthrough.txt ยท Last modified: 2022/05/27 15:09 by frater_secessus

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