RV and vandwellers wiki

User Tools

Site Tools

Trace:
electrical:depth_of_discharge

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision 		Previous revision
Next revision Both sides next revision
electrical:depth_of_discharge [2023/08/17 21:09]
frater_secessus [SoC by voltage] 		electrical:depth_of_discharge [2023/08/17 21:16]
frater_secessus [estimating SoC while resting]
Line 32: Line 32:
  
 {{ 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.  
Line 38: Line 38:
 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.  
  
  
Line 107: Line 107:
  
 **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: 2023/08/17 21:36 by frater_secessus

Page Tools

affilliate disclosure | the RVwiki runs on a virtual server from Phanes

Except where otherwise noted, content on this wiki is licensed under the following license: CC Attribution-Noncommercial-Share Alike 4.0 International
CC Attribution-Noncommercial-Share Alike 4.0 International Donate Powered by PHP Valid HTML5 Valid CSS Driven by DokuWiki