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electrical:12v:alternator [2020/06/25 08:49]
frater_secessus [misc]
electrical:12v:alternator [2020/07/04 11:06] (current)
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.1593100145.txt.gz · Last modified: 2020/06/25 08:49 by frater_secessus