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electrical:depth_of_discharge

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electrical:depth_of_discharge [2020/11/26 10:17]
frater_secessus [SoC by voltage] 		electrical:depth_of_discharge [2023/05/29 12:00]
frater_secessus [SoC by voltage]
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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]].
-===== effect of SoC on battery life =====+ 
 +Note: This information is primarily relevant to lead-chemistry batteries.  Lithium batteries have different DoD capabilities and lifecycles. 
 +===== effect of DoD on battery life =====
  
 How deeply one regularly discharges lead-chemistry batteries will have a **direct effect on how long the battery bank will last**.((Banks are typically replaced when they have lost 20% of their capacity)) How deeply one regularly discharges lead-chemistry batteries will have a **direct effect on how long the battery bank will last**.((Banks are typically replaced when they have lost 20% of their capacity))
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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
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 If the battery rebounds to the desired voltage then repeat to deeper discharge.  Stop when the battery no longer can rebound to the setpoint.  The LVD voltage is the lowest voltage the system can  drop to and still rebound to the desired setpoint when the load is removed.  If the battery rebounds to the desired voltage then repeat to deeper discharge.  Stop when the battery no longer can rebound to the setpoint.  The LVD voltage is the lowest voltage the system can  drop to and still rebound to the desired setpoint when the load is removed. 
  
 +An [[electrical:12v:battery_monitor|amp-counting battery monitor]] may be useful here. 
  
  
electrical/depth_of_discharge.txt · Last modified: 2023/08/17 21:36 by frater_secessus

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