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electrical:12v:self-jumpstarting

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electrical:12v:self-jumpstarting [2021/07/05 12:29]
frater_secessus [dual charging solar charge controllers] 		electrical:12v:self-jumpstarting [2022/04/30 10:39]
frater_secessus [jumping from the house bank]
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 ===== jumping from the house bank ===== ===== jumping from the house bank =====
  
-It will be gentlest on the system to combine the batteries and allow the starter battery to come up a bit instead of immediately attempting to start.  
  
 This will be easiest if one already has some kind of [[electrical:12v:alternator#isolators|isolator/combiner]] setup. If not, one can run jumper cables from the house bank, or physically remove the house bank and carry it to the starter battery area.  This will be easiest if one already has some kind of [[electrical:12v:alternator#isolators|isolator/combiner]] setup. If not, one can run jumper cables from the house bank, or physically remove the house bank and carry it to the starter battery area. 
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 ==== DC-DC chargers ==== ==== DC-DC chargers ====
  
-Some [[electrical:12v:b2b|DC-DC chargers]] with integrated [[electrical:solar:charge_controller|solar charge controllers]] can keep the starter battery maintained after the house batteries are charged.  This would help avoid the "dead starter battery" situation in the first place.+As with diode-based isolators, DC-DC chargers on their own cannot pass power back from the battery bank to the vehicle.  Read below for workarounds and different approaches.  
  
-[Note from secessus:  AFAIK none of the DC-DC chargers natively allow self-jumpstarting.  If anyone knows otherwise, please point me to the documentation.  Thanks!] 
  
 ==== adding self-jumpstart to diode isolators and DC-DC chargers ==== ==== adding self-jumpstart to diode isolators and DC-DC chargers ====
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 Some standalone 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 but can help prevent the dead starter battery.  Some standalone 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 but can help prevent the dead starter battery. 
  
 +[[electrical:12v:alternator#voltage-sensing_relays|dVSR isolators]] automatically connect the banks when house battery is sufficiently charged. 
  
  
electrical/12v/self-jumpstarting.txt · Last modified: 2024/03/22 08:19 by frater_secessus

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