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--- electrical:12v:lifepo4_batteries_thread [2017/08/17 19:34]
frater_secessus [So how do experts charge?]
+++ electrical:12v:lifepo4_batteries_thread [2017/12/09 17:46]
frater_secessus [LiFePO4 charging for RVs: Terrycharging]
@@ Line 31: / Line 31: @@
   * sensitivity to excessive ambient heat (>95F?)((http://www.cruisersforum.com/forums/f14/lifepo4-batteries-discussion-thread-for-those-using-them-as-house-banks-65069-175.html#post1207749))
   * cannot be charged below 32F
+Maine Sail has discussed [[http://www.cruisersforum.com/forums/f129/lithium-batteries-or-agm-194029-2.html#post2522585|the most common errors made by RVers]] vis-a-vis lithium.
 ===== Charging =====
 ==== three stage chargers ====
-LFP batteries do not require multi-stage charging like lead-acid batteries; they are **charged until full and charging is stopped**.  LFP does not have an absorption phase like LA((LFP will pull full current until very nearly full)) and does not need floating in the LA sense((due to low self-discharge rates)).
+LFP batteries do not require multi-stage charging like lead-acid batteries; they are [[electrical:12v:charging#charge-and-stop|charged until full and then charging is stopped]].  LFP does not have an absorption phase like LA((LFP will pull full current until very nearly full)) and does not need floating in the LA sense((due to low self-discharge rates)).
 That said, smart chargers //can// be used to charge LFP.  Maine Sail describes the thought process of utilizing LA smart chargers with LiFePO4:
@@ Line 71: / Line 74: @@
   * no BMS required
-This barefoot (no BMS) and Frac-C approach will be called **Terrycharging** below.
+For lack of a better term, this barefoot (no BMS)/ middle 80% / fractional-C approach will be called **Terrycharging** below.
 ==== LiFePO4 characteristics ====
@@ Line 97: / Line 100: @@
     * RV
       * On solar **blars** does a short 14.v "absorption" by a 13.4v "float".  He notes the float is high-ish but that the sun goes down so it will not be at that voltage a long time.((http://www.cheaprvliving.com/forums/Thread-Lithium-Ion-has-anyone-considered-these-batteries?pid=160365#pid160365)) When charging from shore power through a converter he does a very short "absorption" at 14.2v followed a 13.25v "float".((http://www.cheaprvliving.com/forums/Thread-Lithium-Ion-has-anyone-considered-these-batteries?pid=160365#pid160365))
-      * **29chico** charges at 13.9v-13.9v((http://www.cheaprvliving.com/forums/Thread-Renogy-100w-suitcase-and-Lithium?pid=195318#pid195318)) and recommends going no lower than 12.6v, approx. 10% SoC.((http://www.cheaprvliving.com/forums/Thread-Renogy-100w-suitcase-and-Lithium?pid=195318#pid195318))
+      * **29chico** charges at 13.8v-13.9v((http://www.cheaprvliving.com/forums/Thread-Renogy-100w-suitcase-and-Lithium?pid=195318#pid195318)) and recommends going no lower than 12.6v, approx. 10% SoC.((http://www.cheaprvliving.com/forums/Thread-Renogy-100w-suitcase-and-Lithium?pid=195318#pid195318))
       * **John61ct** recommends charging at 13.8v and floating at 13.2v, when float is required by the controller.((http://www.cruisersforum.com/forums/f14/lifepo4-batteries-discussion-thread-for-those-using-them-as-house-banks-65069-368.html#post2318216))
@@ Line 132: / Line 135: @@
 ===== alternator charging =====
-Unless the alternator's output voltage is dropped with an external regulator the charging voltage will probably be high enough to damage your LFP cells.
+Unless the alternator's output voltage is reduced it can be high enough to damage your LFP cells (ie, > 13.8v).
-Diode-based battery isolators FIXME

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