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electrical:12v:charging [2020/01/07 22:16]
frater_secessus [absorption stage] 		electrical:12v:charging [2020/01/13 11:00]
frater_secessus [temperature compensation]
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 The absorption stage, sometimes called //acceptance//((which makes sense)) or //boost//((doesn't make sense!)), is a constant voltage stage during which the battery is brought to full charge.  This stage requires a **great deal of time** but decreasing amounts of current.   The absorption stage, sometimes called //acceptance//((which makes sense)) or //boost//((doesn't make sense!)), is a constant voltage stage during which the battery is brought to full charge.  This stage requires a **great deal of time** but decreasing amounts of current.  
  
-Absorption **begins when the battery reaches the absorption voltage** ([[electrical:12v:electrical notation|Vabs]], 14.8v in our example) and **ends when the battery tapers off current acceptance** to something like C/100 ("End Absorb", "endAmps"),  and/or when a period of time has elapsed.  In practice absorption takes longer when the battery has been discharged deeply and shorter when it has not.((http://www.cheaprvliving.com/forums/Thread-Can-a-solar-panel-and-charge-controller-over-charge-a-battery?pid=96965#pid96965))+Absorption **begins when the battery reaches the absorption voltage** ([[electrical:12v:electrical notation|Vabs]], 14.8v in our example) and **ends when the battery tapers off current acceptance** to something like [[electrical:12v:battery_capacity|C/100]] ("End Absorb", "endAmps"),  and/or when a period of time has elapsed.   
 + 
 +Example:  if you have a 100Ah battery bank and the manufacturer states that endAmps is C/100, then the battery is fully charged when it is only accepting 1A of current((100Ah/100 = 1A)) **at Vabs**.  An endAmps recommendation of C/200 would be the battery accepting 0.5A of current.((100Ah/200 = 0.5A)) at Vabs.   
 + 
 + 
 +In practice absorption takes longer when the battery has been discharged deeply and shorter when it has not.((http://www.cheaprvliving.com/forums/Thread-Can-a-solar-panel-and-charge-controller-over-charge-a-battery?pid=96965#pid96965))
  
 Some controllers will allow the user to configure the time or ratio of capacity/current (C///n//).  Sternwake says: Some controllers will allow the user to configure the time or ratio of capacity/current (C///n//).  Sternwake says:
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   - ambient temperature as measured by the charger.  This can be different from the actual battery temp due to position, relative height to the battery, or if the charger gets confused by its own heat.    - ambient temperature as measured by the charger.  This can be different from the actual battery temp due to position, relative height to the battery, or if the charger gets confused by its own heat. 
   - in the absence of actual measurements the charger will likely use the 77F laboratory standard.   - in the absence of actual measurements the charger will likely use the 77F laboratory standard.
 +
 +This automatic voltage tweaking for temperature may result in your actual battery voltages being observably higher in cold temps and lower in hot temps. 
  
 ===== watering batteries ====== ===== watering batteries ======
electrical/12v/charging.txt · Last modified: 2023/09/16 12:22 by frater_secessus

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