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electrical:solar:nonessential [2018/05/19 07:22]
frater_secessus [uses for opportunity loads] 		electrical:solar:nonessential [2019/06/23 08:36]
frater_secessus [how much surplus current is there?] pwm heat
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 **During Absorption** the charge current is tapering down as the battery accepts less;  the more it tapers down the more is available for loads.((agaom. normal + opportunity))  At the very beginning of Absorption ~0% of "bonus" output is available.  At the very end of Absorption ~99% is available.  Mid-way through Absorption((judging by current not time)) ~49% of the panels' output is available for loads.  **During Absorption** the charge current is tapering down as the battery accepts less;  the more it tapers down the more is available for loads.((agaom. normal + opportunity))  At the very beginning of Absorption ~0% of "bonus" output is available.  At the very end of Absorption ~99% is available.  Mid-way through Absorption((judging by current not time)) ~49% of the panels' output is available for loads. 
  
-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))  It is for the same reason MPPT provides more current in Bulk:  panel voltage (Vmpp) is not constrained to output voltage ([[electrical:12v:electrical_notation|Vabs]] or [[electrical:12v:electrical_notation|Vfloat]]) and excess voltage is converted into extra current.+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 smaller in Float and late Absorption we one would run opportunity loads anyhow.  Siphoning off power can actually help PWM controllers run cooler by reducing the ON-OFF switching activity that generates heat. 
 + 
 + It is for the same reason MPPT provides more current in Bulk:  panel voltage (Vmpp) is not constrained to output voltage ([[electrical:12v:electrical_notation|Vabs]] or [[electrical:12v:electrical_notation|Vfloat]]) and excess voltage is converted into extra current.
 ===== when to run opportunity loads ===== ===== when to run opportunity loads =====
  
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 ===== timing opportunity loads ===== ===== timing opportunity loads =====
-You can start the loads **manually** (ie, start using the power when you have extra).  This is error-prone.+You can start the loads **manually** (ie, start using the power when you have extra).  This is error-prone but is free and requires no equipment (except your own memory).
  
 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.
electrical/solar/nonessential.txt · Last modified: 2023/10/18 19:08 by frater_secessus

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