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opinion:frater_secessus:lifepo4_charging_voltage

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opinion:frater_secessus:lifepo4_charging_voltage [2023/07/22 00:09]
frater_secessus [lack of pseudo-float] 		opinion:frater_secessus:lifepo4_charging_voltage [2024/02/10 11:33] (current)
frater_secessus [the full process13.6v example
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 ==== TLDR ==== ==== TLDR ====
  
-If this is the problem then reducing the charging voltage will cause the symptoms to improve or disappear.+If excessive charging voltage is the problem then reducing the charging voltage will cause the symptoms to improve or disappear.
  
 [[opinion:frater_secessus:pareto|about these summaries]] [[opinion:frater_secessus:pareto|about these summaries]]
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 LiFePO4 will fully charge at voltages as low as the mid-13s,  but it will take more time.  That extra time is called "Absorption duration"(("boost duration in Renogy- and EpEver-speak)).  At the kinds of current levels we usually see in offgrid charging((~0.2C)) the duration looks like this: LiFePO4 will fully charge at voltages as low as the mid-13s,  but it will take more time.  That extra time is called "Absorption duration"(("boost duration in Renogy- and EpEver-speak)).  At the kinds of current levels we usually see in offgrid charging((~0.2C)) the duration looks like this:
  
-  *  ≥14.0v will charge to 100% SoC with zero minutes of absorption durations: hit the voltage setpoint and //stop//. Cell voltages tend to diverge as charging voltage increases above 14.0v because they are further up the knee (see below)  +  *  ≥14.0v will charge to ~100% SoC with zero minutes of absorption durations: hit the voltage setpoint and //stop//. Cell voltages tend to diverge as charging voltage increases above 14.0v because they are further up the knee (see below)  
-  * 13.8v will charge to 100% SoC with a small amount of Absorption (10-30 minutes?) and cells tend to stay in balance. +  * 13.8v will charge to ~100% SoC with a small amount of Absorption (10-30 minutes?) and cells tend to stay in balance. 
-  * 13.6v will charge to 100% SoC with several hours of Absorption  <-- where we are starting +  * 13.6v will charge to ~100% SoC with several hours of Absorption ([[https://diysolarforum.com/threads/victron-dcdc-12-12-30-charger-no-bluetooth-on-new-install.78373/post-1003471|example]] with data)  <-- where we are starting
-  * 13.4v will //eventually// fully charge the bank but it would take days.  It takes so long we can use 13.4v as a Float voltage.+
  
  
opinion/frater_secessus/lifepo4_charging_voltage.1689998985.txt.gz · Last modified: 2023/07/22 00:09 by frater_secessus

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