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electrical:depth_of_discharge

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electrical:depth_of_discharge [2023/08/18 01:09]
frater_secessus [SoC by voltage] 		electrical:depth_of_discharge [2023/08/18 01:16]
frater_secessus [estimating SoC while resting]
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 {{ http://popupbackpacker.com/wp-content/uploads/2013/12/State-of-Charge-Chart-Trojan.jpg?200|}} {{ http://popupbackpacker.com/wp-content/uploads/2013/12/State-of-Charge-Chart-Trojan.jpg?200|}}
-A rested (no load), fully charged, unFloated lead battery will be 100% around 12.7v-12.8v; see specs for exact numbers.  //We can only reasonably assess SoC by voltage after a full charge.//  After charging is removed the lead battery will start to self-discharge (drain itself), which is why lead batteries require Float charging.+A rested (no load), fully charged, unFloated lead battery will be 100% around 12.7v-12.8v; see specs for exact numbers.  //We can only reasonably assess SoC by voltage after a full charge.//  After charging is removed the lead battery will start to self-discharge (drain itself), which is why lead batteries require Float charging.  **A lead battery that has been fully charged and at Float voltage ever since is assumed to be 100%**.
  
 The famous chart to the right is used to estimate SoC of a rested battery after a full charge.   The famous chart to the right is used to estimate SoC of a rested battery after a full charge.  
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 A rested (no load), fully charged, unFloated lithium battery will be 100% around 13.5-13.6v.  Even with charging removed lithium self-discharge is very low.  The downside of this is that an overcharged Li battery can stay at unhealthy high levels for long periods before self-discharging to a safer range.  A rested (no load), fully charged, unFloated lithium battery will be 100% around 13.5-13.6v.  Even with charging removed lithium self-discharge is very low.  The downside of this is that an overcharged Li battery can stay at unhealthy high levels for long periods before self-discharging to a safer range. 
  
 +As we will see below SoC-by-voltage will appear to be **artificially high during charging**((voltage rise)) and **artificially low during discharging**((voltage sag)).  With some "seat time" on your system you may learn how to interpolate with some degree of accuracy.  
  
  
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 **Lithium batteries** also exhibit voltage sag under load but typically much less than AGM or especially FLA.  An [[electrical:12v:battery_monitor|amp-counting battery monitor]] is the most accurate tool here.   **Lithium batteries** also exhibit voltage sag under load but typically much less than AGM or especially FLA.  An [[electrical:12v:battery_monitor|amp-counting battery monitor]] is the most accurate tool here.  
 +
 +===== estimating SoC while charging =====
 +
 +Similar to voltage sag during discharge, batteries exhibit voltage //surge// or //rise// during charging.  As with discharge, the effect is very strong with FLA, medium with AGM, and lowest with Lithium.   
 +
  
 ===== partial state of charge ===== ===== partial state of charge =====
electrical/depth_of_discharge.txt ยท Last modified: 2023/08/18 01:36 by frater_secessus

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