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electrical:12v:alternator

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electrical:12v:alternator [2020/05/21 07:45]
frater_secessus [Alternator charging]
electrical:12v:alternator [2020/05/24 09:08]
frater_secessus [alternator hacks]
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-Power from the alternator is shared with the house battery using an isolator of some sort.  This allows the [[electrical:​12v:​intro|house battery]] to charge but does not allow the house battery to pull power from the starter battery.+Power from the alternator is shared with the house battery using an isolator ​("​Split charge relay" / SCR) of some sort.  This allows the [[electrical:​12v:​intro|house battery]] to charge but does not allow the house battery to pull power from the starter battery.
  
 ==== constant-duty solenoid ==== ==== constant-duty solenoid ====
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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]].+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
  
-Idling the engine to run the alternator ​can seriously overheat the alternator. ​ It is usually cooled by wind from the vehicle'​s forward motion; ​ a fan may help cool the alternator.+**Idling the engine** to charge house batteries **can seriously overheat the alternator**.  It is usually cooled by wind from the vehicle'​s forward motion; ​ a fan may help cool the alternator.
  
-==== wiring ====+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)). ​  
 + 
 +===== wiring ​=====
  
 2 gauge copper wire connecting the coach and house is recommended for most alternator charging installs. ​ SternWake recommends attaching at the alternator rather than the battery.((http://​www.cheaprvliving.com/​forums/​Thread-Charge-house-batteries-with-DC?​pid=110652#​pid110652)) 2 gauge copper wire connecting the coach and house is recommended for most alternator charging installs. ​ SternWake recommends attaching at the alternator rather than the battery.((http://​www.cheaprvliving.com/​forums/​Thread-Charge-house-batteries-with-DC?​pid=110652#​pid110652))
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 Note that you will only have to run the POS+ leg of wire to the house battery as the chassis ground is the other leg. Note that you will only have to run the POS+ leg of wire to the house battery as the chassis ground is the other leg.
  
-==== alternator hacks ===+==== alternator hacks ====
  
 There are ways to get the alternator to pump out more power: There are ways to get the alternator to pump out more power:
electrical/12v/alternator.txt · Last modified: 2020/07/04 11:06 by frater_secessus