User Tools

Site Tools


electrical:12v:self-jumpstarting

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision
Previous revision
electrical:12v:self-jumpstarting [2018/07/03 11:22]
frater_secessus
electrical:12v:self-jumpstarting [2020/10/11 19:48] (current)
Line 3: Line 3:
 Self-jumpstarting means jumpstarting one's own vehicle without the use of another vehicle.  The most common way to do this is by [[electrical:12v:alternator|combining]] house and chassis batteries. Self-jumpstarting means jumpstarting one's own vehicle without the use of another vehicle.  The most common way to do this is by [[electrical:12v:alternator|combining]] house and chassis batteries.
  
-===== solenoids ===== + 
-Solenoids/relays will automatically self-jumpstart assuming there is enough voltage in the starter battery to energize the solenoid. It is a mechanical connection and power will flow both ways. +
  
-===== relays =====+===== 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.  
 +==== manual switches ==== 
 + 
 +Switches used as manual isolators will self-jumpstart when in the ON position.  
 +==== solenoids ==== 
 + 
 +Solenoids/relays //always// self-jumpstart assuming there is enough voltage in the starter battery to energize the solenoid. It is a mechanical connection and power will flow both ways. 
 + 
 +==== voltage sensing relays ==== 
 + 
 +SomeVSRs have a button to combine the batteries for self-jumpstarting.   
 + 
 +==== relays ====
  
 [[electrical:12v:alternator#isolators|Solid state isolators]] are diode based and will not allow power to flow from the house battery to the starter battery.  Therefore they cannot be used to self-jumpstart. [[electrical:12v:alternator#isolators|Solid state isolators]] are diode based and will not allow power to flow from the house battery to the starter battery.  Therefore they cannot be used to self-jumpstart.
 +
 +==== 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.
 +
 +[Note from secessus:  AFAIK none of the DC-DC chargers allow self-jumpstarting.  If anyone knows otherwise, please point me to the documentation.  Thanks!]
 +
 +==== dual charging solar charge controllers ====
 +
 +Some 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. 
 +
 +
 +
  
 ===== jump packs ===== ===== jump packs =====
electrical/12v/self-jumpstarting.1530631363.txt.gz · Last modified: 2020/10/11 19:48 (external edit)