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electrical:depth_of_discharge [2020/08/02 12:55]
frater_secessus [SoC by voltage] 		electrical:depth_of_discharge [2022/01/26 01:22]
princess_fluffypants [Depth of discharge / State of Charge]
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 DoD has a **significant impact on longevity of deep cycle batteries**.  For this reason [[electrical:inverter|Inverters]] and other high-load devices may have a [[electrical:12v:lvd|low voltage cutoff]]. DoD has a **significant impact on longevity of deep cycle batteries**.  For this reason [[electrical:inverter|Inverters]] and other high-load devices may have a [[electrical:12v:lvd|low voltage cutoff]].
 +
 +Note: This information is primarily relevant to lead-chemistry batteries.  Lithium batteries have different DoD capabilities and lifecycles.
 ===== effect of SoC on battery life ===== ===== effect of SoC on battery life =====
  
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 | | | | | | | | | | | | | | | | | | | |
-|  **DoD**|  **State of Charge**|  **power per cycle**|  **Num. of cycles**|  **lifetime power in Kah((Ah * / 1000))**|  **levelled cost / Kah**|  **life in years**|  **Sets needed for target Ah**|  **Weight**|+|  **DoD**|  **State of Charge**|  **power per cycle**|  **Num. of cycles**|  **lifetime power in kAh((Ah *  1000))**|  **levelled cost / Kah**|  **life in years**|  **Sets needed for target Ah**|  **Weight**|
 |  10|  90|  22.5| | | | | | | |  10|  90|  22.5| | | | | | |
 |  20|  80|  45|  3000|  135|  $1.93|  8.2|  3.9|  482| |  20|  80|  45|  3000|  135|  $1.93|  8.2|  3.9|  482|
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 ==== SoC by voltage ==== ==== SoC by voltage ====
 +
 +Note: read [[https://marinehowto.com/under-load-battery-voltage-vs-soc/|this article by mainesail]]
  
 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]]. 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]].
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   * intermittent heavier loads that leave the system with measured >=12.2v when that load is removed   * intermittent heavier loads that leave the system with measured >=12.2v when that load is removed
  
-The more challenging task is judging when to kill the circuit based on voltage **under heavier loads**.  It may take experimentation with your system to see where the battery voltage rebounds after removing the heavy loads.  An approach might be:+The more challenging task is judging when to kill the circuit based on voltage **under heavier loads**. Consider this chart: 
 + 
 +{{ https://i.stack.imgur.com/bm93G.jpg}} 
 + 
 +For a 200A bank 50% DoD would be 12.1v at rest, ~12.0v at C/10 (20A discharge), ~11.55v at C/5 (40A discharge), and 11.2v at C/3 (~70A discharge).  
 + 
 +It may take experimentation with your system to see where the battery voltage rebounds after removing the heavy loads.  An approach might be:
  
   - apply expected load   - apply expected load
electrical/depth_of_discharge.txt · Last modified: 2023/08/17 21:36 by frater_secessus

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