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electrical:12v:drop-in_lifepo4 [2022/07/04 13:09]
frater_secessus [myth: you must use DC-DC for alternator charging Li] 		electrical:12v:drop-in_lifepo4 [2022/07/04 13:17]
frater_secessus [myth: you must use DC-DC for alternator charging Li]
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 === testing your isolator with Li === === testing your isolator with Li ===
  
-Here an order of operations one might use to assess whether or not isolator charging will work in a given install:+Here an order of operations one might use to assess whether or not isolator charging will work in a given install:((discontinue at once if you observe unacceptable results, and consider DC-DC or increasing solar)):
  
-  - Read and understand your Li battery manufacturer's charging specs+  - Read and understand your Li battery manufacturer's charging specs - undercharging is fine((assuming one stays above 20% State of Charge)); overcharging is less so but is relatively rare in an isolator context.
   - Read and understand your alternator's specs   - Read and understand your alternator's specs
   - Read and understand your isolator's specs and functionality   - Read and understand your isolator's specs and functionality
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   - install [[electrical:12v:battery_monitor|a battery monitor]] so you can observe current and voltage at the battery.  Or use the battery's own BT access.   - install [[electrical:12v:battery_monitor|a battery monitor]] so you can observe current and voltage at the battery.  Or use the battery's own BT access.
   - make the first test run a brief one and with the Li fairly well charged.((higher states of charge will typically lessen current demands to some degree))  Start the engine and see if the charging current and voltage is acceptable.  Turn off the engine.   - make the first test run a brief one and with the Li fairly well charged.((higher states of charge will typically lessen current demands to some degree))  Start the engine and see if the charging current and voltage is acceptable.  Turn off the engine.
-  - If that works test it with longer drives and/or with the Li at lower states of charge.  Bring a passenger to observe battery monitor if needed. +  - 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 expected state of charge you expect to recharge from alternator. 
  
 **Caveats**:   **Caveats**:  
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   * 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]].   * 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 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)
  
 === but that Victron video! === === but that Victron video! ===
electrical/12v/drop-in_lifepo4.txt · Last modified: 2024/05/21 22:08 by frater_secessus

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