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electrical:12v:alternator

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electrical:12v:alternator [2024/04/05 11:10]
frater_secessus [gotchas] 		electrical:12v:alternator [2024/04/09 14:41]
frater_secessus [limitations] timing
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   * they have **no way to limit current** other than hitting their max rating and failing or tripping.((diode-based isolators will reduce current somewhat due to forward-voltage losses))   This might mean the battery can pull more current than is good for itself or for the alternator, necessitating the use of [[electrical:12v:b2b|a DC-DC charger]].  This typically is an issue only with oversized banks or small alternators.    * they have **no way to limit current** other than hitting their max rating and failing or tripping.((diode-based isolators will reduce current somewhat due to forward-voltage losses))   This might mean the battery can pull more current than is good for itself or for the alternator, necessitating the use of [[electrical:12v:b2b|a DC-DC charger]].  This typically is an issue only with oversized banks or small alternators. 
   * they **can't boost voltage**((diode isolators will reduce voltage)) like DC-DC.  They are not "smart" and have no charging stages -- the house bank will be charged at alternator voltage while the engine is running. Compare your alternator's voltage output to the battery manufacturer's Absorption charging voltage [[electrical:solar:charge_controller_setpoints|setpoint]] before going this route.     * they **can't boost voltage**((diode isolators will reduce voltage)) like DC-DC.  They are not "smart" and have no charging stages -- the house bank will be charged at alternator voltage while the engine is running. Compare your alternator's voltage output to the battery manufacturer's Absorption charging voltage [[electrical:solar:charge_controller_setpoints|setpoint]] before going this route.  
-  * the charge acceptance rate (Amps) will decrease as bank voltage rises;  this is called the //current taper//.+  * the charge acceptance rate (Amps) will decrease as bank voltage rises;  this is called the //current taper//.  Because of the taper if you want to get maximal harvest for your engine's gasoline consumption it would be better to charge when the bank is low than if the bank is nearly full. 
   * vehicles with //smart// (variable voltage) alternators are usually not suitable for charging with normal combiners.((https://www.redarc.com.au/how-do-i-know-if-i-have-a-variable-voltage-smart-alternator))  See [[electrical:12v:alternator#smart_alternators|below]]   * vehicles with //smart// (variable voltage) alternators are usually not suitable for charging with normal combiners.((https://www.redarc.com.au/how-do-i-know-if-i-have-a-variable-voltage-smart-alternator))  See [[electrical:12v:alternator#smart_alternators|below]]
  
electrical/12v/alternator.txt ยท Last modified: 2024/04/26 17:11 by frater_secessus

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