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electrical:solar:nonessential [2020/01/13 11:34]
frater_secessus [opportunity loads] 		electrical:solar:nonessential [2020/07/08 11:26]
frater_secessus [LVD + timer]
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 There will generally be more "surplus" power available when using MPPT charge controllers v. PWM,((http://forum.solar-electric.com/discussion/comment/372165#Comment_372165))((http://forum.solar-electric.com/discussion/comment/250746#Comment_250746)) though the difference is less dramatic during periods one would run opportunity loads (see [[electrical:solar:nonessential#when_to_run_opportunity_loads|below]]).  Siphoning off power can actually **help PWM controllers run cooler** by reducing the ON-OFF switching activity that generates heat. There will generally be more "surplus" power available when using MPPT charge controllers v. PWM,((http://forum.solar-electric.com/discussion/comment/372165#Comment_372165))((http://forum.solar-electric.com/discussion/comment/250746#Comment_250746)) though the difference is less dramatic during periods one would run opportunity loads (see [[electrical:solar:nonessential#when_to_run_opportunity_loads|below]]).  Siphoning off power can actually **help PWM controllers run cooler** by reducing the ON-OFF switching activity that generates heat.
  
 +[[electrical:solar:overpaneling|Overpaneled]] systems have even more excess power available. 
 ===== when to run opportunity loads ===== ===== when to run opportunity loads =====
  
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 The most precise way to do it **automatically** is to use a charge controller which turns on the LOAD output only when the batteries are in Float stage.  Charge controllers with this feature tend to be expensive. The most precise way to do it **automatically** is to use a charge controller which turns on the LOAD output only when the batteries are in Float stage.  Charge controllers with this feature tend to be expensive.
  
 +You can also build a Pi or similar that talks to the controller over its communication port/protocol and checks when the controller is in Float.
 ==== LVD only ==== ==== LVD only ====
  
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 ==== LVD + timer ==== ==== LVD + timer ====
 {{ :electrical:solar:discretionaryTimer.png?400|}} {{ :electrical:solar:discretionaryTimer.png?400|}}
-A [[http://amzn.to/2pN3O9o|12v timer]] could give the system a chance to make some progress in Absorption before starting up opportunity loads.  +A [[http://amzn.to/2pN3O9o|12v timer]] could give the system a chance to make some progress in Absorption before starting up opportunity loads.  If mistimed or overly heavy loads applied, Absorption duration could be affected. 
  
  
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 This setup looks like:  [LVD or controller LOAD output] --> timer --> relay --> load This setup looks like:  [LVD or controller LOAD output] --> timer --> relay --> load
 +
 +==== LVD + timer - eternal Absorption ====
 +
 +This setup avoids timer juggling/estimation and does not affect Absorption charging.
 +
 +  - set Vfloat to Vabs
 +  - observe measure how long Absorption actually takes to drop to [[electrical:solar:charge_controller_setpoints|endAmps]] on your system
 +  - set the LVD to just under Vabs, set the timer to the Absorption duration
  
  
electrical/solar/nonessential.txt ยท Last modified: 2023/10/18 19:08 by frater_secessus

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