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electrical:12v:alternator [2024/04/09 14:41]
frater_secessus [limitations] timing 		electrical:12v:alternator [2024/04/26 16:56]
frater_secessus [TLDR]
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   * In many situations, it is possible to use a simple/inexpensive battery [[electrical:12v:alternator#combiners|combiner]] or [[electrical:12v:alternator#proper_isolators|isolator]] between the house batteries and the vehicle battery. These will allow the house battery to charge when the vehicle is running, but will prevent the vehicle battery from being drained when the engine is off.   * In many situations, it is possible to use a simple/inexpensive battery [[electrical:12v:alternator#combiners|combiner]] or [[electrical:12v:alternator#proper_isolators|isolator]] between the house batteries and the vehicle battery. These will allow the house battery to charge when the vehicle is running, but will prevent the vehicle battery from being drained when the engine is off.
     * Some situations may benefit from or [[electrical:12v:mandatory_dcdc|require DC-DC chargers]] in between the vehicle batteries and the house batteries.      * Some situations may benefit from or [[electrical:12v:mandatory_dcdc|require DC-DC chargers]] in between the vehicle batteries and the house batteries. 
 +  * charging is //triggered// by a 12v signal(("D+", "IGN", "ACC")) and/or by voltage-sensing((monitoring of the actual voltage coming from the chassis)) 
   * Idling the engine while parked for long periods of time just to recharge the batteries is possible, but generally a bad idea.   * Idling the engine while parked for long periods of time just to recharge the batteries is possible, but generally a bad idea.
     * Pulling a lot of power from the alternator causes it to generate a lot of heat. When the vehicle is moving there's enough airflow to keep the alternator cool, but when parked the heat will build up and can damage the alternator.     * Pulling a lot of power from the alternator causes it to generate a lot of heat. When the vehicle is moving there's enough airflow to keep the alternator cool, but when parked the heat will build up and can damage the alternator.
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 It may be desirable to disable alternator charging on-the-fly when stopped in traffic, on hot days, to avoid charging frozen Li cells,((using a temperature controller)) stop charging at a given voltage,((using a [[electrical:12v:alternator_charging_hvd|High Voltage Disconnect]])) or neutralize [[electrical:12v:alternator#gotchas|gotchas]], etc.  The method of disabling will vary depending on the gear: It may be desirable to disable alternator charging on-the-fly when stopped in traffic, on hot days, to avoid charging frozen Li cells,((using a temperature controller)) stop charging at a given voltage,((using a [[electrical:12v:alternator_charging_hvd|High Voltage Disconnect]])) or neutralize [[electrical:12v:alternator#gotchas|gotchas]], etc.  The method of disabling will vary depending on the gear:
  
-  * relays and DC-DC that are triggered solely by D+ can be disabled by a switch on the D+ wire+  * relays and DC-DC that are triggered solely by D+ can be disabled by a switch on the D+ wire.  [[https://www.reddit.com/r/VanLife/comments/1c4vjl0/is_this_renogy_a_good_dcdc_option_for_a_200ah/kzuc78v/|Additional control could be introduced]] with a relay and or delay ([[https://amzn.to/3TUEbmu|example]])
   * VSR triggered by voltage can can be disabled by a switch on the thin ground wire on the VSR itself.((the VSR requires a ground to make a complete circuit to run internal electronics.  Breaking this circuit turns off the  VSR))     * VSR triggered by voltage can can be disabled by a switch on the thin ground wire on the VSR itself.((the VSR requires a ground to make a complete circuit to run internal electronics.  Breaking this circuit turns off the  VSR))  
   * some DC-DC can be //derated// by providing a 12v signal to the CURRENT LIMIT terminal ([[electrical:12v:b2b#renogy1|Renogy DC1212 series]], [[electrical:12v:b2b#leaptrend|Leaptrend]])   * some DC-DC can be //derated// by providing a 12v signal to the CURRENT LIMIT terminal ([[electrical:12v:b2b#renogy1|Renogy DC1212 series]], [[electrical:12v:b2b#leaptrend|Leaptrend]])
electrical/12v/alternator.txt ยท Last modified: 2024/05/09 14:00 by frater_secessus

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