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electrical:12v:psoc [2017/11/09 00:32]
frater_secessus [optimal deep cycling] 		electrical:12v:psoc [2022/05/06 16:14] (current)
frater_secessus [Partial State of Charge]
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 ====== Partial State of Charge ====== ====== Partial State of Charge ======
  
-//Partial state of charge// (PSoC) refers to the state of a lead-chemistry battery when it is left below 100%  State of Charge (partially [[electrical:depth_of_discharge|discharged]]).  Both long periods of PSoC and lower voltage are damaging to lead acid batteries (ie, [[electrical:batterycide|battery murder]]), usually due to "hard sulfation" (see [[#sulfation|below]]).+//Partial state of charge// (PSoC) refers to the state of a lead-chemistry battery when it is left below 100%  State of Charge (partially [[electrical:depth_of_discharge|discharged]]), which lead-chemistry batteries do not like.((Vandwellers who expect PSoC conditions may get better results from battery chemistries that don't mind PSoC, like Lithium or carbon-doped lead.)) 
 + 
 + 
 +Since state of charge is measured "on the way down" from [[electrical:12v:charging|full charging]] PSoC can result from: 
 + 
 +  - failure to fully charge lead batteries (typically [[electrical:batterycide|failure to hold Vabs for sufficient duration]], widespread); or 
 +  - fully and correctly charging but then allowing the battery to rest without a Float (maintenance) charge (less common) 
 + 
 + 
 +Both long periods of PSoC and incomplete charging are damaging to lead acid batteries (ie, [[electrical:batterycide|battery murder]]), usually due to "hard sulfation" (see [[#sulfation|below]]).
  
  
 ===== optimal deep cycling ===== ===== optimal deep cycling =====
  
-In a perfect world, lead-acid batteries (both flooded and AGM) would be discharged no further than 50% then [[electrical:12v:charging|fully charged]] again((ie, to 100% State of Charge)) each day.+In a perfect world, lead-acid batteries (both flooded and AGM) would be discharged no further than 20% then [[electrical:12v:charging|fully charged]] again((ie, to 100% State of Charge)) each day.  In some studies this 20% depletion yields the most Ah/$.  The downside is carrying around a lot of "dead lead", capacity that is never used.  
 + 
 +In actual usage it is more common to discharge to 50% SoC.  This allows 2.5x the power to be used overnight at the cost of longevity.
  
 It is easier to get the batteries fullly charged each day when [[electrical:solar:overpaneling#vs_battery_bank|they are overpaneled]], but that trades battery health for less reserve for [[electrical:solar:output#insolation|days of poor insolation]]. It is easier to get the batteries fullly charged each day when [[electrical:solar:overpaneling#vs_battery_bank|they are overpaneled]], but that trades battery health for less reserve for [[electrical:solar:output#insolation|days of poor insolation]].
electrical/12v/psoc.1510187551.txt.gz · Last modified: 2020/10/11 23:48 (external edit)

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