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--- electrical:12v:self-jumpstarting [2017/10/11 16:02]
frater_secessus created
+++ electrical:12v:self-jumpstarting [2020/08/14 13:08]
frater_secessus added SunSaver
@@ Line 1: / Line 1: @@
 ====== Self-jumpstarting ======
-Self-jumpstarting means jumpstarting one's 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.
-isolators
+===== jumping from the house bank =====
-jump packs
+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.
+==== 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 =====
+[[https://amzn.to/2ITeBba|Lithium "jump packs"]] have become more popular.  Lithium-chemistry batteries can discharge quickly, so even relative small packs can jumpstart a car.
+'Dwellers may want to pick a jump pack that has 12v or USB outlets so it can have other uses.

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