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electrical:12v:alternator [2020/06/25 11:49]
frater_secessus [misc]
electrical:12v:alternator [2020/07/04 14:06]
frater_secessus [limitations]
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 Alternator charging is generally only practical for the [[electrical:12v:charging|bulk charge stage]] due to relatively low voltage output and the [[electrical:12v:charging|long time periods required for absorption]].(([[electrical:12v:b2b|DC-DC chargers]] can help with the voltage))  It is unlikely to get the house battery completely charged unless one is driving significant distances. This can have an impact on [[electrical:batterycide|battery longevity]].  If one drives often [[electrical:12v:alt_and_solar|a combination of the alternator doing bulk charging and a small solar doing the rest]] is good match. Alternator charging is generally only practical for the [[electrical:12v:charging|bulk charge stage]] due to relatively low voltage output and the [[electrical:12v:charging|long time periods required for absorption]].(([[electrical:12v:b2b|DC-DC chargers]] can help with the voltage))  It is unlikely to get the house battery completely charged unless one is driving significant distances. This can have an impact on [[electrical:batterycide|battery longevity]].  If one drives often [[electrical:12v:alt_and_solar|a combination of the alternator doing bulk charging and a small solar doing the rest]] is good match.
  
-Vehicles with //smart// (variable voltage) alternators may not be suitable for charging with normal isolators.((https://www.redarc.com.au/how-do-i-know-if-i-have-a-variable-voltage-smart-alternator))  See [[electrical:12v:b2b|DC-DC chargers]].+Vehicles with //smart// (variable voltage) alternators may not be suitable for charging with normal isolators.((https://www.redarc.com.au/how-do-i-know-if-i-have-a-variable-voltage-smart-alternator))  See [[electrical:12v:alternator#smart_alternators|below]].
  
 See [[electrical:12v:mandatory solar|Is Solar Mandatory?]] for ideas on how to charge primarily by alternator. See [[electrical:12v:mandatory solar|Is Solar Mandatory?]] for ideas on how to charge primarily by alternator.
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 Anecdotally the problem appears to be worsened with **excessive idling**, although this may be a subset of situations where "the engine doesn’t run long enough or hard enough to get hot enough to burn any of the carbon off."((https://automotiverepairphoenix.com/ask-car-guy-can-carbon-build-impact-engine/)) Anecdotally the problem appears to be worsened with **excessive idling**, although this may be a subset of situations where "the engine doesn’t run long enough or hard enough to get hot enough to burn any of the carbon off."((https://automotiverepairphoenix.com/ask-car-guy-can-carbon-build-impact-engine/))
  
 +===== smart alternators =====
  
 +Traditional alternators typically try to hold a set voltage.  //Smart alternators// talk to the vehicle's ECU (compuuter) vary output voltage depending on present conditions.  It might unload the alternator during heavy acceleration to reduce parasitic losses, or run the alternator at high voltage just after starting to speed up the recovery of used energy.((https://www.redarc.com.au/alternator-vs-fixed-alternator))
 +
 +The use of plain isolators with smart alternators may result in the rapid cycling of the isolator's circuit (with voltage sensing types) or the discharge of the house battery into the starter battery (solendoid type).
 +
 +[[electrical:12v:b2b|DC-DC chargers]] and/or isolators with an awareness of smart alternators may be required.
  
  
electrical/12v/alternator.txt · Last modified: 2024/03/15 12:27 by frater_secessus