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electrical:12v:charging [2023/05/28 18:51]
frater_secessus [Bulk stage] 		electrical:12v:charging [2023/09/16 16:22] (current)
frater_secessus [Collected recommendations]
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     * AGM 0.4C max((https://www.renogy.com/template/files/Specifications/RNG-BATT-AGM12-200.pdf)) unless labeled with 0.3C max     * AGM 0.4C max((https://www.renogy.com/template/files/Specifications/RNG-BATT-AGM12-200.pdf)) unless labeled with 0.3C max
     * GEL 0.3C((https://www.renogy.com/content/RBT100GEL12-G1/GEL100-Datasheet.pdf))     * GEL 0.3C((https://www.renogy.com/content/RBT100GEL12-G1/GEL100-Datasheet.pdf))
 +  * Rolls((https://rollsbattery.com/wp-content/uploads/2018/01/Rolls_Battery_Manual.pdf))
 +    * Flooded 0.1C
 +    * AGM 0.2C (min 0.1C, max 0.3C)
 +    * GEL 0.2C (min 0.1C, max 0.3C)
 +  * Lifeline((https://lifelinebatteries.com/wp-content/uploads/2015/12/6-0101F-Lifeline-Technical-Manual-Final-5-06-19.pdf))
 +    * AGM up to 5C inrush, 0.2C minimum((https://marinehowto.com/how-fast-can-an-agm-battery-be-charged/))
 +  * Odyssey((https://www.odysseybatteries.com/odyssey/docs/us-ody-tm.pdf))
 +    * AGM 0.4C minimum, no maximum
 +  * EastPenn/Deka - 0.3C max((https://www.eastpennmanufacturing.com/wp-content/uploads/Renewable-Energy-Charging-Parameters-1913.pdf)) - 
  
 ==== Absorption stage ==== ==== Absorption stage ====
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 The absorption stage, sometimes called //acceptance//((which makes sense)) or //boost//((doesn't make sense!)), is a constant voltage stage during which the battery is brought to full charge.  This stage requires a **great deal of time** but decreasing amounts of current.   The absorption stage, sometimes called //acceptance//((which makes sense)) or //boost//((doesn't make sense!)), is a constant voltage stage during which the battery is brought to full charge.  This stage requires a **great deal of time** but decreasing amounts of current.  
  
-Absorption **begins when the battery reaches the absorption voltage** ([[electrical:12v:electrical notation|Vabs]], 14.8v in our example) and **ends when the battery tapers off current acceptance** to something like [[electrical:12v:battery_capacity|C/100]] ("End Absorb", "endAmps"),  and/or when a period of time has elapsed.  +Absorption **begins when the battery reaches the absorption voltage** ([[electrical:12v:electrical notation|Vabs]], 14.8v in our example) and **ends when the battery tapers off current acceptance**((that the battery is taking from the charging source)) to something like [[electrical:12v:battery_capacity|C/100]] to C/50((1A-2A per 100AH of capacity)) ("tail current", "End Absorb", "endAmps"),  and/or when a period of time has elapsed.  
  
 Example:  if you have a 100Ah battery bank and the manufacturer states that endAmps is C/100, then the battery is fully charged when it is only accepting 1A of current((100Ah/100 = 1A)) **at Vabs**.  An endAmps recommendation of C/200 would be the battery accepting 0.5A of current.((100Ah/200 = 0.5A)) at Vabs.   Example:  if you have a 100Ah battery bank and the manufacturer states that endAmps is C/100, then the battery is fully charged when it is only accepting 1A of current((100Ah/100 = 1A)) **at Vabs**.  An endAmps recommendation of C/200 would be the battery accepting 0.5A of current.((100Ah/200 = 0.5A)) at Vabs.  
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   - Float voltage - Li does not like to sit at 100% SoC,((the cells degrade faster at 100%+ SoC)) so a float voltage in the 13s allows them to come down off the peak and rest at a healthier voltage for them while still holding useful capacity.   - Float voltage - Li does not like to sit at 100% SoC,((the cells degrade faster at 100%+ SoC)) so a float voltage in the 13s allows them to come down off the peak and rest at a healthier voltage for them while still holding useful capacity.
  
-Also see [[electrical:12v:lifepo4_batteries_thread#charging|LiFePO4 (lithium) bare cell charging]]. +Also see [[electrical:12v:lifepo4_batteries_thread#charging|LiFePO4 (lithium) bare cell charging]] and [[electrical:12v:drop-in_lifepo4#an_approach_to_greater_longevity|thoughts about charging LFP gently]].
  
 ===== Equalization ===== ===== Equalization =====
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 | Interstate GC2((https://www.interstatebatteries.com/support/golf-cart-battery-installation-and-maintenance))                                                                                                                                                                              | Min C/10 \\ Max C/7.7((.13C))\\ Vabs 14.8v\\ Vfloat 13.5v\\ Veq 16.2v                                                                                                                                                                         |                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                    |                                                                                                               | | Interstate GC2((https://www.interstatebatteries.com/support/golf-cart-battery-installation-and-maintenance))                                                                                                                                                                              | Min C/10 \\ Max C/7.7((.13C))\\ Vabs 14.8v\\ Vfloat 13.5v\\ Veq 16.2v                                                                                                                                                                         |                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                    |                                                                                                               |
 |                                                                                                                                                                                                                                                                                           |                                                                                                                                                                                                                                               |                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                    |                                                                                                               | |                                                                                                                                                                                                                                                                                           |                                                                                                                                                                                                                                               |                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                    |                                                                                                               |
 +
 +====== further reading ======
 +
 +  * [[https://web.archive.org/web/20150919125248/https://c34.org/bbs/index.php/topic,8216.0.html|Why going to float is NOT full]]
  
electrical/12v/charging.1685299876.txt.gz · Last modified: 2023/05/28 18:51 by frater_secessus

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