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electrical:12v:drop-in_lifepo4 [2022/06/05 13:36]
frater_secessus [myth: you must use DC-DC for alternator charging Li] 		electrical:12v:drop-in_lifepo4 [2022/06/05 13:38]
frater_secessus [myth: you must use DC-DC for alternator charging Li]
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 They do recommend [[electrical:12v:alternator#lithium-specific|a BIM]] or [[electrical:12v:b2b|DC-DC charger]] //for banks >300Ah//. They do recommend [[electrical:12v:alternator#lithium-specific|a BIM]] or [[electrical:12v:b2b|DC-DC charger]] //for banks >300Ah//.
  
-Reminder:  don't [[rv:idling|idle]] to charge batteries.  //Any// type of batteries.  
  
 === why an isolator? === === why an isolator? ===
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   * you already have an [[electrical:12v:alternator|isolator]] installed from a previous Pb bank.  Might as well see if it meets needs "for free".   * you already have an [[electrical:12v:alternator|isolator]] installed from a previous Pb bank.  Might as well see if it meets needs "for free".
   * even if you have no isolator installed an isolator is much less expensive, costing as little as 1/10th the price of DC-DC. If after testing you do decide to go DC-DC you can carry the isolator as a backup.    * even if you have no isolator installed an isolator is much less expensive, costing as little as 1/10th the price of DC-DC. If after testing you do decide to go DC-DC you can carry the isolator as a backup. 
-  * an isolator is likely to charge with more current than smaller (~20A) DC-DC units during Bulk charging during shorter drives.((On longer drives the DC-DC will be able to provide higher voltage than the alternator so its current will remain stable while isolator current drops with the voltage delta))  +  * an isolator is likely to charge with more current than smaller (~20A) DC-DC units during shorter drives.((On longer drives the DC-DC will be able to provide higher voltage than the alternator so its current will remain stable while isolator current drops with the voltage delta))  
  
  
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 **Caveats**:   **Caveats**:  
  
-  * Only alternator charge while driving (no idling except for brief preliminary test).  +  * Only alternator charge while driving ([[rv:idling|no idling]] except for brief preliminary test).  
   * Pay attention while charging from alternator to keep from overcharging the Li or holding for long periods at high [[electrical:depth_of_discharge|states of charge]].   * Pay attention while charging from alternator to keep from overcharging the Li or holding for long periods at high [[electrical:depth_of_discharge|states of charge]].
   * You may want a manual disconnect or [[electrical:12v:alternator_charging_hvd|HVD]] to shut off alternator charging.  These can be added on the D+ wire (ignition triggered) or electronics ground wire (VSR, solenoid, or voltage-triggered DC-DC)   * You may want a manual disconnect or [[electrical:12v:alternator_charging_hvd|HVD]] to shut off alternator charging.  These can be added on the D+ wire (ignition triggered) or electronics ground wire (VSR, solenoid, or voltage-triggered DC-DC)
electrical/12v/drop-in_lifepo4.txt ยท Last modified: 2024/04/12 23:02 by frater_secessus

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