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electrical:12v:alternator

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electrical:12v:alternator [2024/04/16 11:31]
frater_secessus [disabling alternator charging] delay 		electrical:12v:alternator [2024/04/26 16:57]
frater_secessus [fuel consumption]
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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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 see [[electrical:12v:alternator_details#current|this related article]] on assessing how much current you can safely take from the alternator see [[electrical:12v:alternator_details#current|this related article]] on assessing how much current you can safely take from the alternator
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-===== fuel consumption ===== 
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-Fuel consumption for power generation will be greatest when the vehicle is idled.  When charging loads are imposed on a vehicle that is already driving the added cost can be minimal. 
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-Using the 3.6L [[rv:ram_promaster|Promaster]] with a 40A [[electrical:12v:b2b|DC-DC charger]] as an example, ObvB estimates: 
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->> In terms of cost, an average USA price of gas at $3.36, **idling** for 2 hours to produce 1kWh with a 40A DC-DC charger would burn 2 * (2/3 + 0.074) gal = 1.48 gal = **$4.97 / kWh**. If you were going to be **driving** anyway, then the additional cost of turning on a DC-DC charger (using my assumptions) would be about **50c/kWh**.((https://www.promasterforum.com/threads/fuel-consumption-at-idle.103939/post-841876))  
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electrical/12v/alternator.txt ยท Last modified: 2024/05/09 14:00 by frater_secessus

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