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electrical:12v:alternator [2019/06/23 20:41] frater_secessus [sizing an isolator] |
electrical:12v:alternator [2019/07/12 12:27] frater_secessus [limitations] |
===== limitations ===== | ===== 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]]. It is unlikely to get the house battery completely charged unless one is driving significant distances. This can have an impact on 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]]. 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. |
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Charging the house batteries from the alternator increases the load on the alternator and can be expected to contribute to earlier failure. SternWake reports **idling while charging causes a sharp increase in alternator temperature**.((http://www.cheaprvliving.com/forums/Thread-Longer-alternator-life-when-used-to-charge-house-batteries?pid=182096#pid182096)) So don't idle it! | Charging the house batteries from the alternator increases the load on the alternator and can be expected to contribute to earlier failure. SternWake reports **idling while charging causes a sharp increase in alternator temperature**.((http://www.cheaprvliving.com/forums/Thread-Longer-alternator-life-when-used-to-charge-house-batteries?pid=182096#pid182096)) So don't idle it! |
* a higher-output alternator will put out more power | * a higher-output alternator will put out more power |
* a different **voltage regulator** for older vehicles, [[http://www.cheaprvliving.com/forums/Thread-Your-Vehicles-voltage-regulator|as demonstrated by SternWake]], increases the voltage available for charging but also increases the coach voltage. | * a different **voltage regulator** for older vehicles, [[http://www.cheaprvliving.com/forums/Thread-Your-Vehicles-voltage-regulator|as demonstrated by SternWake]], increases the voltage available for charging but also increases the coach voltage. |
* a [[http://www.sterling-power-usa.com|Sterling]] "fake load" regulator will cause the alternator to put out more amps and then will DC-DC convert the voltage up to correct charging range.((http://www.sterling-power-usa.com/library/What%20is%20an%20alternator%20to%20battery%20charger.pdf)). This is the opposite direction of how [[electrical:solar:charge_controller|MPPT charging]] works. | * a [[http://www.sterling-power-usa.com|Sterling]] "fake load" regulator will cause the alternator to put out more amps and then will DC-DC convert the voltage up to correct charging range.((http://www.sterling-power-usa.com/library/What%20is%20an%20alternator%20to%20battery%20charger.pdf)). This is the opposite direction of how [[electrical:solar:charge_controller|MPPT charging]] works. Also see [[electrical:12v:b2b|b2b chargers]]. |
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===== using the coach battery only ===== | ===== using the coach battery only ===== |
A simple possible approach would be to replace the starter battery with a marine or AGM battery.((http://www.cheaprvliving.com/forums/Thread-Easiest-simplest-cheapest-power-set-up)) | A simple possible approach would be to [[electrical:solar:shallow_cycling|replace the starter battery with a marine or AGM battery]].((http://www.cheaprvliving.com/forums/Thread-Easiest-simplest-cheapest-power-set-up)) |
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===== further reading ===== | ===== further reading ===== |