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electrical:12v:alternator [2024/03/02 19:08]
frater_secessus [paralleling different chemistries] 		electrical:12v:alternator [2024/03/15 12:27]
frater_secessus [combiners]
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 ===== paralleling different chemistries ===== ===== paralleling different chemistries =====
  
-It is often said that one cannot parallel batteries of different chemistries.  This is not so.  The problem is keeping batteries with different resting voltages connected //after charging is removed//.  The isolator setup is specifically designed to isolate the batteries when there is no charging.((DC-DC chargers and diode isolators keep them isolated 100% of the time, even when charging is present))  +It is often said that one cannot parallel batteries of different chemistries.  This is not so.  The problem would be keeping batteries with different resting voltages connected //after charging is removed//.  If they were left connected the higher-voltage batt would discharge into the lower-voltage batt.  Note: **an isolator setup is specifically designed to keep this from happening**.
  
 As long as the alternator voltage is acceptable to both battery chemistries they can be paralleled during charging.   As long as the alternator voltage is acceptable to both battery chemistries they can be paralleled during charging.  
 +
 +**Example** using a flooded starter battery, LiFePO4 house battery, relay, and 14.2v alternator:
 +
 +  * **charging**:  both batteries will charge to 14.2v (given enough time) 
 +  * **no charging**:  relay separates ("isolates") the batteries.  Starter batt rests at 12.7v and lithium at 13.5v. 
 +
  
 ===== alternator voltage ===== ===== alternator voltage =====
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 "Split charge relay (SCR)", "split charger", "automatic charge relay (ACR)", "Voltage sensing relay (VSR)", solenoid, relay, etc.  "Split charge relay (SCR)", "split charger", "automatic charge relay (ACR)", "Voltage sensing relay (VSR)", solenoid, relay, etc. 
  
-Power from the alternator is shared with the house battery by paralleling the two sets of batteries at certain times. This allows the [[electrical:12v:intro|house battery]] to charge but does not allow the house battery to pull power from the starter battery when not combined.+Power from the alternator is shared with the house battery by paralleling the two sets of batteries at certain times. This allows the [[electrical:12v:intro|house battery]] to charge but does not allow the house battery to pull power from the starter battery when not combined.  [[https://www.youtube.com/shorts/nHS7aJuJd6c|This short video]] illustrates how it works. 
  
  
electrical/12v/alternator.txt ยท Last modified: 2024/06/13 11:53 by frater_secessus

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