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electrical:depth_of_discharge [2019/02/07 13:14]
frater_secessus 		electrical:depth_of_discharge [2020/03/09 15:43]
frater_secessus [Depth of discharge / State of Charge]
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 ====== Depth of discharge / State of Charge ====== ====== Depth of discharge / State of Charge ======
  
-{{ http://popupbackpacker.com/wp-content/uploads/2013/12/State-of-Charge-Chart-Trojan.jpg?200|}}//Depth-of-discharge (DoD or DOD)// refers to how low a deep cycle battery is taken before recharging.  DoD is the inverse of //State of Charge (SoC)//.  Example:  a battery at 30% DoD is at 70% SoC.+{{ http://popupbackpacker.com/wp-content/uploads/2013/12/State-of-Charge-Chart-Trojan.jpg?200|}}//Depth-of-discharge (DoD or DOD)// refers to how low a deep cycle battery is taken between [[electrical:12v:charging|full charges]].  DoD is the inverse of //State of Charge (SoC)//.  Example:  a battery at 30% DoD is at 70% SoC.
  
 For solar powered systems the greatest DoD (and therefore lowest SoC) will be in early morning just before the panels start creating power again. For solar powered systems the greatest DoD (and therefore lowest SoC) will be in early morning just before the panels start creating power again.
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 ===== SoC by voltage ===== ===== SoC by voltage =====
  
 +100% SoC (~12.7v) is measured [[electrical:12v:charging|after the bank has been fully charged]] and then rested. It is measured "on the way down";  measuring "on the way up" while charging will lead to false confidence and leaving the battery [[electrical:12v:psoc|less than fully charged]].
  
 The voltage level associated with 50% DoD is widely discussed.  **12.1v rested** is generally used as 50% State of Charge (SoC).  A more conservative approach uses **12.2vdc rested**. The voltage level associated with 50% DoD is widely discussed.  **12.1v rested** is generally used as 50% State of Charge (SoC).  A more conservative approach uses **12.2vdc rested**.
 +
 Since resting is rare in most practical scenarios stopping at 12.2vdc under light loads would be a practical approach.  DC expert SternWake((http://www.cheaprvliving.com/forums/User-SternWake)) says: Since resting is rare in most practical scenarios stopping at 12.2vdc under light loads would be a practical approach.  DC expert SternWake((http://www.cheaprvliving.com/forums/User-SternWake)) says:
 //"...those who are loading their battery and stop at 12.2v are treating their battery better, just not using all the capacity they could and perhaps seriously inconveniencing themselves by thinking they need to stop at this point, especially if the loads are fairly large, like while running a laptop and watching tv and while their fridge compressor is running."//((http://www.cheaprvliving.com/forums/Thread-Noob-Questions-About-Failing-SLA-Batteries?pid=92249#pid92249)) //"...those who are loading their battery and stop at 12.2v are treating their battery better, just not using all the capacity they could and perhaps seriously inconveniencing themselves by thinking they need to stop at this point, especially if the loads are fairly large, like while running a laptop and watching tv and while their fridge compressor is running."//((http://www.cheaprvliving.com/forums/Thread-Noob-Questions-About-Failing-SLA-Batteries?pid=92249#pid92249))
 +
 By this yardstick both of these uses should keep DoD from going beyond 50%: By this yardstick both of these uses should keep DoD from going beyond 50%:
   * constant light loads with measured >=12.2v   * constant light loads with measured >=12.2v
electrical/depth_of_discharge.txt ยท Last modified: 2023/08/17 21:36 by frater_secessus

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