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electrical:12v:lifepo4_batteries_thread [2017/07/27 10:25] frater_secessus [Suitability for RV use] |
electrical:12v:lifepo4_batteries_thread [2017/11/22 09:31] frater_secessus [Suitability for RV use] |
* 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)) | * 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 | * cannot be charged below 32F |
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| 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. |
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===== Charging ===== | ===== Charging ===== |
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==== three stage chargers ==== | ==== 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)). |
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That said, smart chargers //can// be used to charge LFP. Maine Sail describes the thought process of utilizing LA smart chargers with LiFePO4: | That said, smart chargers //can// be used to charge LFP. Maine Sail describes the thought process of utilizing LA smart chargers with LiFePO4: |
* RV | * 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)) | * 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)) | * **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)) |
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===== notable voltage reference points ===== | ===== notable voltage reference points ===== |