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electrical:12v:self-jumpstarting [2018/07/03 11:22] frater_secessus |
electrical:12v:self-jumpstarting [2020/10/11 19:48] 127.0.0.1 external edit |
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. |
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===== 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. | |
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===== relays ===== | ===== jumping from the house bank ===== |
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| 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. |
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| 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 ==== |
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| Switches used as manual isolators will self-jumpstart when in the ON position. |
| ==== solenoids ==== |
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| 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. |
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| ==== voltage sensing relays ==== |
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| SomeVSRs have a button to combine the batteries for self-jumpstarting. |
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| ==== relays ==== |
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[[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. |
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| ==== DC-DC chargers ==== |
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| 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. |
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| [Note from secessus: AFAIK none of the DC-DC chargers allow self-jumpstarting. If anyone knows otherwise, please point me to the documentation. Thanks!] |
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| ==== dual charging solar charge controllers ==== |
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| 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. |
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===== jump packs ===== | ===== jump packs ===== |