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electrical:12v:directcharginglfp

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electrical:12v:directcharginglfp [2024/03/20 12:00]
frater_secessus [assessing your own setup for direct alternator charging] 		electrical:12v:directcharginglfp [2024/03/20 12:07]
frater_secessus [assessing your own setup for direct alternator charging]
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 ===== assessing your own setup for direct alternator charging ===== ===== assessing your own setup for direct alternator charging =====
  
-[Note:  this section errs on the side of methodical plodding in the spirit of "don't eat this mattress" or "do not juggle chainsaws on the top step of this ladder".  For existing setups it's can be as simple as starting the engine briefly to see how much current is drawn and going from there.  The existing fuse will intervene if the current is harmfully large.]+[Note:  this section errs on the side of methodical plodding in the spirit of "don't eat this mattress" or "do not juggle chainsaws on the top step of this ladder".  For existing setups it can be as simple as starting the engine briefly to see how much current is drawn and going from there.  The existing fuse would intervene if the current is harmfully large.]
  
  
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   - test it with a drive.   - test it with a drive.
   - repeat the last two steps with the Li bank at lower and lower states of charge, down to the lowest state of charge you expect to recharge from alternator.   - repeat the last two steps with the Li bank at lower and lower states of charge, down to the lowest state of charge you expect to recharge from alternator.
-  - disconnect the isolator with **a switch** when you come to the desired SoC, when charge rate exceeds your preferences, when stuck in traffic, etc +  - celebrate
  
 **Caveats**:   **Caveats**:  
  
   * Only alternator charge while driving ([[rv:idling|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]]. You may want a manual disconnect or [[electrical:12v:alternator_charging_hvd|HVD]] to shut off alternator charging due to excess voltage or if the bank is already charged.  These can be added on the D+ wire (ignition triggered) or electronics ground wire (VSR, solenoid, or voltage-triggered DC-DC) +  * 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 [[electrical:12v:alternator#disabling_alternator_charging|a manual disconnect]] or [[electrical:12v:alternator_charging_hvd|HVD]] to shut off alternator charging due to excess voltage or if the bank is already charged.  These can be added on the D+ wire (ignition triggered) or electronics ground wire (VSR, solenoid, or voltage-triggered DC-DC) 
-  * Fuse the wiring from the chassis so the bank cannot pull more than you specify +  * if current is excessive but you want to direct-charge, you can tweak acceptance with resistance or voltage as seen elsewhere in this article
-  * if current is higher than you want consider adding resistance to the circuit+
  
 ===== the parts list ===== ===== the parts list =====
electrical/12v/directcharginglfp.txt · Last modified: 2024/04/04 11:51 by frater_secessus

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