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electrical:12v:lifepo4_batteries_thread [2017/12/09 14:49]
frater_secessus [Synopsis of C&S LiFePO4 batteries thread]
electrical:12v:lifepo4_batteries_thread [2017/12/09 14:52]
frater_secessus
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 This can make LFP banks less complex and less expensive in an RV application. ​ Assessing SOC by voltage is also more accurate with Fractional C charging/​discharging than with high currents.  ​ This can make LFP banks less complex and less expensive in an RV application. ​ Assessing SOC by voltage is also more accurate with Fractional C charging/​discharging than with high currents.  ​
-==== LiFePO4 charging for RVs: Terrycharging ​====+==== LiFePO4 charging for RVs: running barefoot ​====
  
 Although his setup does not use it, T1 Terry describes a "​middle 80%" approach that works well with Fractional C systems. It can eliminate the need for [[electrical:​12v:​BMS|BMS]] balancing: Although his setup does not use it, T1 Terry describes a "​middle 80%" approach that works well with Fractional C systems. It can eliminate the need for [[electrical:​12v:​BMS|BMS]] balancing:
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   * keeps the voltage "​between the [voltage] knees",​ 13.8v - 11.8v.((http://​www.cruisersforum.com/​forums/​f14/​lifepo4-batteries-discussion-thread-for-those-using-them-as-house-banks-65069-103.html#​post1140470)) ​ This is also called the "​middle 80%".   * keeps the voltage "​between the [voltage] knees",​ 13.8v - 11.8v.((http://​www.cruisersforum.com/​forums/​f14/​lifepo4-batteries-discussion-thread-for-those-using-them-as-house-banks-65069-103.html#​post1140470)) ​ This is also called the "​middle 80%".
   * does not //require// strapping((http://​www.cruisersforum.com/​forums/​f14/​lifepo4-batteries-discussion-thread-for-those-using-them-as-house-banks-65069-59.html#​post1118000)) although it is a recommended best practice((http://​www.cruisersforum.com/​forums/​f14/​lifepo4-batteries-discussion-thread-for-those-using-them-as-house-banks-65069-253.html#​post1574064))   * does not //require// strapping((http://​www.cruisersforum.com/​forums/​f14/​lifepo4-batteries-discussion-thread-for-those-using-them-as-house-banks-65069-59.html#​post1118000)) although it is a recommended best practice((http://​www.cruisersforum.com/​forums/​f14/​lifepo4-batteries-discussion-thread-for-those-using-them-as-house-banks-65069-253.html#​post1574064))
-  * no BMS required+  * no BMS required ​("​running barefoot"​) 
 + 
 +Since the defining feature of this approach is the lack of BMS, it will be referred to as "​barefoot"​ on this page. 
  
-For lack of a better term, this barefoot (no BMS)/ middle 80% / fractional-C approach will be called **Terrycharging** below.  ​ 
  
 ==== LiFePO4 characteristics ==== ==== LiFePO4 characteristics ====
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 |  16.80| ​ 4.20|cell damage((http://​www.cruisersforum.com/​forums/​f14/​lifepo4-batteries-discussion-thread-for-those-using-them-as-house-banks-65069-93.html#​post1137808)) ​ | |  16.80| ​ 4.20|cell damage((http://​www.cruisersforum.com/​forums/​f14/​lifepo4-batteries-discussion-thread-for-those-using-them-as-house-banks-65069-93.html#​post1137808)) ​ |
 |  14.40| ​ 3.60|High Voltage Cutoff((http://​www.cruisersforum.com/​forums/​f14/​lifepo4-batteries-discussion-thread-for-those-using-them-as-house-banks-65069-109.html#​post1142567)) ​ | |  14.40| ​ 3.60|High Voltage Cutoff((http://​www.cruisersforum.com/​forums/​f14/​lifepo4-batteries-discussion-thread-for-those-using-them-as-house-banks-65069-109.html#​post1142567)) ​ |
-|  **13.80**| ​ 3.45|**Terrycharging ​Vabs**, with gentle overcharge for balancing. ​ Max safe non-BMS voltage.((http://​www.cruisersforum.com/​forums/​f14/​lifepo4-batteries-discussion-thread-for-those-using-them-as-house-banks-65069-44.html#​post1096480)) ​ |+|  **13.80**| ​ 3.45|**barefoot ​Vabs**, with gentle overcharge for balancing. ​ Max safe non-BMS voltage.((http://​www.cruisersforum.com/​forums/​f14/​lifepo4-batteries-discussion-thread-for-those-using-them-as-house-banks-65069-44.html#​post1096480)) ​ |
 |  13.60| ​ 3.40|fully charged ​ | |  13.60| ​ 3.40|fully charged ​ |
-|  **13.40**| ​ 3.35|**Terrycharging ​Vfloat** ​ |+|  **13.40**| ​ 3.35|**barefoot ​Vfloat** ​ |
 |  13.25| ​ 3.31|20% Depth of Discharge ​ | |  13.25| ​ 3.31|20% Depth of Discharge ​ |
 |  12.80| ​ 3.20|50% Depth of Discharge FIXME. ​ Long-term storage.((http://​www.cruisersforum.com/​forums/​f14/​lifepo4-batteries-discussion-thread-for-those-using-them-as-house-banks-65069-172.html#​post1201146)) ​ | |  12.80| ​ 3.20|50% Depth of Discharge FIXME. ​ Long-term storage.((http://​www.cruisersforum.com/​forums/​f14/​lifepo4-batteries-discussion-thread-for-those-using-them-as-house-banks-65069-172.html#​post1201146)) ​ |
 |  12.40| ​ 3.10|80% Depth of Discharge. ​ Best for storage?​((http://​www.cruisersforum.com/​forums/​f14/​lifepo4-batteries-discussion-thread-for-those-using-them-as-house-banks-65069-384.html#​post2383574)) ​ | |  12.40| ​ 3.10|80% Depth of Discharge. ​ Best for storage?​((http://​www.cruisersforum.com/​forums/​f14/​lifepo4-batteries-discussion-thread-for-those-using-them-as-house-banks-65069-384.html#​post2383574)) ​ |
-|  **11.80**| ​ 2.95|**Terrycharging ​Low Voltage Disconnect**. ​ Min safe non-BMS voltage. ((http://​www.cruisersforum.com/​forums/​f14/​lifepo4-batteries-discussion-thread-for-those-using-them-as-house-banks-65069-103.html#​post1140470)) ​ |+|  **11.80**| ​ 2.95|**barefoot ​Low Voltage Disconnect**. ​ Min safe non-BMS voltage. ((http://​www.cruisersforum.com/​forums/​f14/​lifepo4-batteries-discussion-thread-for-those-using-them-as-house-banks-65069-103.html#​post1140470)) ​ |
 |  11.20| ​ 2.80|100% Depth of Discharge((http://​www.cruisersforum.com/​forums/​f14/​lifepo4-batteries-discussion-thread-for-those-using-them-as-house-banks-65069-104.html#​post1140620)). ​ Low Voltage Cutoff.((http://​www.cruisersforum.com/​forums/​f14/​lifepo4-batteries-discussion-thread-for-those-using-them-as-house-banks-65069-109.html#​post1142567)) ​ | |  11.20| ​ 2.80|100% Depth of Discharge((http://​www.cruisersforum.com/​forums/​f14/​lifepo4-batteries-discussion-thread-for-those-using-them-as-house-banks-65069-104.html#​post1140620)). ​ Low Voltage Cutoff.((http://​www.cruisersforum.com/​forums/​f14/​lifepo4-batteries-discussion-thread-for-those-using-them-as-house-banks-65069-109.html#​post1142567)) ​ |
  
electrical/12v/lifepo4_batteries_thread.txt · Last modified: 2017/12/09 15:02 by frater_secessus