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electrical:12v:directcharginglfp [2022/10/28 10:45]
frater_secessus [assessing your own setup for direct alternator charging] 		electrical:12v:directcharginglfp [2023/01/10 11:21]
frater_secessus [Isolator charging LiFePO4 banks]
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-====== Isolator charging LiFePO4 banks ======+====== Direct charging LiFePO4 banks ======
  
 There is an [[electrical:12v:drop-in_lifepo4#mythyou_must_use_dc-dc_for_alternator_charging_li|often-repeated claim]] that LiFePO4 house banks will pull always monstrous levels of  current and destroy alternators if a plain [[electrical:12v:alternator|isolator]] is used instead of a [[electrical:12v:b2b|DC-DC charger]]. This claim is not supported by empirical testing. The data below provide **actual measurements** to help people make informed decisions.  We will see that **current demand by LFP banks follows a known formula** rather than the opinions of people on the internet.  There is an [[electrical:12v:drop-in_lifepo4#mythyou_must_use_dc-dc_for_alternator_charging_li|often-repeated claim]] that LiFePO4 house banks will pull always monstrous levels of  current and destroy alternators if a plain [[electrical:12v:alternator|isolator]] is used instead of a [[electrical:12v:b2b|DC-DC charger]]. This claim is not supported by empirical testing. The data below provide **actual measurements** to help people make informed decisions.  We will see that **current demand by LFP banks follows a known formula** rather than the opinions of people on the internet. 
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   - **overcharging** (holding Vabs after reaching 100% SoC) is actually a bigger concern, particularly if one drives for hours.  A manual switch on the isolator (D+ for solenoids, on the ground wire for VSR) will allow the owner to disable alternator charging at will.    - **overcharging** (holding Vabs after reaching 100% SoC) is actually a bigger concern, particularly if one drives for hours.  A manual switch on the isolator (D+ for solenoids, on the ground wire for VSR) will allow the owner to disable alternator charging at will. 
  
-So this article will focus on current demand by LiFePO4 house banks.+This article will focus on current demand by LiFePO4 house banks.
  
 ===== the formula in 60 seconds ===== ===== the formula in 60 seconds =====
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 {{https://img.mousetrap.net/misc/isolatorMaxCRate.jpg}} {{https://img.mousetrap.net/misc/isolatorMaxCRate.jpg}}
  
-The average max current drawn from the alternator is **0.33C**, or 1/3rd of what the warnings predict.   **This the same C-rate that AGM pulls when cycled to 50% DoD**.+The average max current drawn from the alternator is **0.33C**, or 1/3rd of what the warnings predict.   **This the same C-rate that AGM pulls when cycled to 50% DoD**.  You can use these C-rate reports as a way to ballpark what your own Li bank might pull. 
  
  
electrical/12v/directcharginglfp.txt ยท Last modified: 2024/04/04 11:51 by frater_secessus

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