Differences

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

--- electrical:depth_of_discharge [2023/05/29 12:00]
frater_secessus [SoC by voltage]
+++ electrical:depth_of_discharge [2023/08/17 20:43]
frater_secessus [Depth of discharge / State of Charge]
@@ Line 1: / Line 1: @@
 ===== 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]].  Specifically, what percentage of the rated capacity remains at a given point?   Example:  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.
+DoD is the inverse of //State of Charge (SoC)//.  Example:  a battery at 30% DoD is at 70% SoC.
-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 lead deep cycle batteries**.((and, to a lesser degree, lithium batteries))  For this reason [[electrical:inverter|Inverters]] and other high-load devices may have a [[electrical:12v:lvd|low voltage cutoff]] to prevent going below a given SoC, typically 50%.
-Note: This information is primarily relevant to lead-chemistry batteries.  Lithium batteries have different DoD capabilities and lifecycles.
+Note: This information (including the chart to the right) is primarily relevant to lead-chemistry batteries.  Lithium batteries have [[#lithium_soc|different DoD capabilities and lifecycles]].
 ===== effect of DoD on battery life =====
@@ Line 97: / Line 97: @@
 This section [[electrical:12v:psoc|has moved]].
+===== lithium SoC =====
+Lithium chemistries have very flat voltage curves, making it  notoriously difficult to gauge SoC by voltage.  In this case [[electrical:12v:battery_monitor|a shunted battery monitor]] is used to count amps as they go in/out.  If the Li battery has connectivity you may be able to read SoC from the internal BMS.

RV and vandwellers wiki

User Tools

Site Tools

Differences

Page Tools