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electrical:solar:output

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electrical:solar:output [2019/02/13 16:23]
frater_secessus [shade] 		electrical:solar:output [2020/01/22 10:10]
frater_secessus [Factors affecting solar panel output]
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 ====== Factors affecting solar panel output ====== ====== Factors affecting solar panel output ======
  
-For various reasons **it will be a rare event when your panels put out their full rated power**.  One reason for this is **the power needs somewhere to go**;  unless you are in [[electrical:12v:charging#bulk_stage|Bulk stage]] or have a big load on the system there is no point in making big power. +For various reasons **it will be a rare event when your panels put out their full rated power**.  One reason for this is **the power needs somewhere to go**;  unless you are in [[electrical:12v:charging#bulk_stage|Bulk stage]] or are running big loads you will not see the system making anything like it's capacity.  Even under perfect conditions. 
  
 The other big reason is that **power ratings are derived from testing under specific lab conditions**.  The standard lab test is at: The other big reason is that **power ratings are derived from testing under specific lab conditions**.  The standard lab test is at:
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 ===== shade ===== ===== shade =====
-Partial shade in good sun can have a drastic effect on panel output.  This is because panels are made of strings of individual solar cells;  having some strings turned "on" and some "off" (to prevent reversing current //into// the shaded cell) can +Partial shade in good sun can have a drastic effect on panel output.  This is because panels are made of strings of individual solar cells;  having some strings turned "on" and some "off" (to prevent reversing current //into// the shaded cells) can result in dramatic power reduction. 
  
-This effect can be attenuated somewhat by panel design (bypass diodes), parallel rather than serial panel connections, use of amorphous panels, and the use of MPPT controllers. +  
 + 
 +This effect can be attenuated somewhat by panel design (bypass diodes), [[electrical:solar:series_vs_parallel|parallel rather than serial panel connections]] when using PWM controllers, use of amorphous (thin-film) panels, and the use serial rather than parallel panel connections of MPPT controllers. 
  
  
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 ===== cleanliness ===== ===== cleanliness =====
  
-Dusty panels cause a derating of about 5%.    FIXME+According to Sandia lab testing, dusty panels cause a derating of about 5%.((FIXME citation))
 ===== further information ===== ===== further information =====
  
electrical/solar/output.txt · Last modified: 2024/02/21 11:49 by frater_secessus

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