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electrical:depth_of_discharge [2020/06/10 13:01]
frater_secessus [effect of SoC on battery life] 		electrical:depth_of_discharge [2020/06/23 10:55]
frater_secessus
Line 36: Line 36:
  
  
-===== SoC by amps =====+===== estimatating SoC ===== 
 + 
 +==== SoC by specific gravity ==== 
 + 
 +> "The truest measure of a [lead chemistry] 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 for 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)]] 
 + 
 + 
 + 
 +==== SoC by amps ====
  
 A [[electrical:12v:battery_monitor|battery monitor]], usually a amp/coulumb counter with a shunt, will measure the current going to/from the battery.  It will often show real-time current flow and a state of charge percentage.  It may also show voltage (see below). A [[electrical:12v:battery_monitor|battery monitor]], usually a amp/coulumb counter with a shunt, will measure the current going to/from the battery.  It will often show real-time current flow and a state of charge percentage.  It may also show voltage (see below).
  
 +Note that deep cycle battery [[electrical:12v:battery_capacity|capacities]] are given at the "20 hour rate", roughly depleting the battery over the course of a day/night cycle. Heavier loads will cause apparent capacity to decrease.  Lithium is much less susceptible and tends to deliver more predictable capacity. 
  
  
  
-===== 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]]. 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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   * 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)]] 
- 
- 
  
  
electrical/depth_of_discharge.txt · Last modified: 2023/08/17 21:36 by frater_secessus

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