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electrical:12v:maintaining_starter_battery

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electrical:12v:maintaining_starter_battery [2024/11/21 00:47]
frater_secessus [maintaining starter batteries] 		electrical:12v:maintaining_starter_battery [2025/04/12 12:49] (current)
frater_secessus [starter battery chargers alongside DC-DC chargers]
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 ===== maintaining starter batteries ===== ===== maintaining starter batteries =====
  
-  * Some [[electrical:12v:b2b#examples_-_combo_with_solar_charge_controller|combo DC-DC chargers]] contain logic to maintain the starter battery when solar power is present. +  * Some [[electrical:12v:b2b#examples_-_combo_with_solar_charge_controller|combo DC-DC chargers]] contain logic to maintain the starter battery when solar power is present.  For specifics see the ''starter battery maintenance behavior'' section in each listing.  
-  * the [[https://amzn.to/40WMp2L|Bluetti 800w alternator charger]] (DC-DC) has a starter battery maintenance function.+  * the [[https://amzn.to/40WMp2L|Ecoflow 800w alternator charger]] (DC-DC) has a starter battery maintenance function.
   * Some standalone [[electrical:solar:charge_controller|solar charge controllers]] like the [[https://amzn.to/2PPTD2L|Morningstar SunSaver Duo]] can, for example,  charge the start battery with 10% of solar harvest and the house battery with 90% using different charging profiles.  As with DC-DC above, it's not self-jumpstarting in the normal sense but can help prevent the dead starter battery.    * Some standalone [[electrical:solar:charge_controller|solar charge controllers]] like the [[https://amzn.to/2PPTD2L|Morningstar SunSaver Duo]] can, for example,  charge the start battery with 10% of solar harvest and the house battery with 90% using different charging profiles.  As with DC-DC above, it's not self-jumpstarting in the normal sense but can help prevent the dead starter battery. 
   * [[electrical:12v:alternator#voltage-sensing_relays|dVSR isolators]] (including [[electrical:12v:alternator#lithium-specific_vsr|the Li-BIM]]) automatically connect the banks when the voltage on either side reaches defined setpoints.    * [[electrical:12v:alternator#voltage-sensing_relays|dVSR isolators]] (including [[electrical:12v:alternator#lithium-specific_vsr|the Li-BIM]]) automatically connect the banks when the voltage on either side reaches defined setpoints. 
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 ==== starter battery chargers alongside DC-DC chargers ==== ==== starter battery chargers alongside DC-DC chargers ====
  
-If a DC-DC is present and relatively weak shore power charging is applied to the starter battery there are circumstances where the DC-DC can cycle on-off constantly.  Let's consider a 20A DC-DC and a 10A starter battery maintainer.+If a DC-DC is present and an additional & relatively weak source of charging is applied to the starter battery the DC-DC can cycle on-off continually.  Let's consider a 20A DC-DC and a 10A starter battery maintainer.
  
   - starter battery at 12.7v before charging applied   - starter battery at 12.7v before charging applied
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 To avoid this scenario either: To avoid this scenario either:
  
-  * ensure the DC-DC rating is smaller than the starter battery rating; or +  * ensure the DC-DC rating is smaller than the starter battery charger's rating; or 
-  * apply the shore power charging to the house bank side instead((for DC-DC models with starter battery maintenance, see above))+  * apply any additional charging to the house bank side instead((for DC-DC models with starter battery maintenance, see above))
  
  
  
electrical/12v/maintaining_starter_battery.1732168063.txt.gz · Last modified: 2024/11/21 00:47 by frater_secessus

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