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 [2020/03/09 15:43]
frater_secessus [Depth of discharge / State of Charge] 		electrical:depth_of_discharge [2020/06/10 13:01]
frater_secessus [effect of SoC on battery life]
Line 1: Line 1:
-====== 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 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. {{ 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.
Line 6: Line 6:
  
 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 =====
 +
 +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))
 +
  
 The **most common discharge limit for deep cycle batteries is 50% DoD**.  This gives a good balance between usability and longevity.  The **lowest cost per Ah** occurs around 30% DoD although this requires buying, installing, and moving //dead lead// or unusable battery capacity.((20% DoD is the limit at which manufacturers rate their battery's cycles.))   The **most common discharge limit for deep cycle batteries is 50% DoD**.  This gives a good balance between usability and longevity.  The **lowest cost per Ah** occurs around 30% DoD although this requires buying, installing, and moving //dead lead// or unusable battery capacity.((20% DoD is the limit at which manufacturers rate their battery's cycles.))  
Line 12: Line 16:
   * lowest cost per Ah happens at 30% DoD   * lowest cost per Ah happens at 30% DoD
   * longest life happens at 20% DoD   * longest life happens at 20% DoD
-  * least battery weight happens at 80%+  * least battery weight happens at 80% DoD
 so make your DoD decision based on what is most important to you. so make your DoD decision based on what is most important to you.
 +
 | |  **T105 Ah**| |  **Cost**|  **weight per set**|  **Target Ah**| | | | | |  **T105 Ah**| |  **Cost**|  **weight per set**|  **Target Ah**| | | |
 | |  225| |  $260.00|  124|  175| | | | | |  225| |  $260.00|  124|  175| | | |
Line 50: Line 55:
   * constant light loads with measured >=12.2v   * constant light loads with measured >=12.2v
   * 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
 +
 +===== SoC by specific gravity =====
 +
 +> "The truest measure of a battery's state of charge is the specific gravity of the battery acid." -- Rolls battery.((http://support.rollsbattery.com/support/solutions/articles/428-state-of-charge-charging-flooded-lead-acid-batteries))
 +
 +Only flooded-type batteries are practical SoC assessment by SG of the electrolyte.  Needed for this operation: 
 +
 +  * temperature of the battery
 +  * SG chart from the battery manufacuturer
 +  * [[https://amzn.to/3dOHGEU|battery SG tester (hydrometer)]]
 +
 +
 +
 +
 +
 ===== partial state of charge ===== ===== partial state of charge =====
 This section [[electrical:12v:psoc|has moved]]. This section [[electrical:12v:psoc|has moved]].
  
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