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electrical:12v:alternator

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electrical:12v:alternator [2020/07/12 20:47]
frater_secessus [gotchas] 		electrical:12v:alternator [2020/10/11 11:46]
frater_secessus [gotchas]
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 ===== gotchas ===== ===== gotchas =====
  
-Alternator charging may bring some battery chemistries (like lithium) to **unsuitably high voltages**.   A [[electrical:12v:hvd|high voltage disconnect]] can [[electrical:12v:alternator charging hvd|restrict alternator charging to lower voltages]].  [[electrical:12v:b2b|DC-DC chargers]] can also regulate voltage provided to the house battery. + 
 +Solar charging while the isolator circuit is closed (ie, batteries connected) can pass higher-than-normal voltage to the chassis and starter battery.  See notes on HVD and DC-DC charging above. 
  
 Voltage-sensing regulators can be [[http://bdp.mousetrap.net/index.php/2018/10/27/side-effect-of-solar-alternator-charging/|triggered or "held closed" by voltage from the solar-charged side]] in some scenarios.   Address with HVD as above if desired.  Voltage-sensing regulators can be [[http://bdp.mousetrap.net/index.php/2018/10/27/side-effect-of-solar-alternator-charging/|triggered or "held closed" by voltage from the solar-charged side]] in some scenarios.   Address with HVD as above if desired. 
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 In early morning when house battery voltage is lowest, **a plain solenoid may unintentionally allow depleted batteries to pull down the starter battery**.  Workarounds:  use a VSR, or start the vehicle immediately after inserting the key((ie, do not leave in the Accessory position which would drain the starter battery)).   In early morning when house battery voltage is lowest, **a plain solenoid may unintentionally allow depleted batteries to pull down the starter battery**.  Workarounds:  use a VSR, or start the vehicle immediately after inserting the key((ie, do not leave in the Accessory position which would drain the starter battery)).  
 +
 +Solar charging while the isolator circuit is closed may [[opinion:frater_secessus:alternatorSolarStall|"stall" at alternator voltage]].
 +
 +Alternator charging may bring some battery chemistries (like bare lithium cells with no BMS) to **unsuitably high voltages**.   A [[electrical:12v:hvd|high voltage disconnect]] can [[electrical:12v:alternator charging hvd|restrict alternator charging to lower voltages]].  [[electrical:12v:b2b|DC-DC chargers]] can also regulate voltage provided to the house battery. 
 +
  
 ===== wiring ===== ===== wiring =====
electrical/12v/alternator.txt · Last modified: 2024/05/09 14:00 by frater_secessus

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