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electrical:12v:alternator [2019/06/03 16:29]
frater_secessus [Alternator charging] |
electrical:12v:alternator [2019/06/23 18:01]
frater_secessus [isolators] |
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| * when batteries are deeply discharged | * when batteries are deeply discharged |
| * when [[electrical:12v:alt and solar|combined with solar]] | * when [[electrical:12v:alt and solar|combined with solar]] or some other higher-voltage charging source |
| * when used with battery chemistries like [[electrical:12v:lifepo4_batteries_thread|lithium]] that do not need [[electrical:12v:charging|staged charging]]. | * when used with battery chemistries like [[electrical:12v:lifepo4_batteries_thread|lithium]] that do not need [[electrical:12v:charging|staged charging]]. |
| * when used with a [[electrical:12v:b2b|battery-to-battery boosting charger]] that can produce correct charging voltage | * when used with a [[electrical:12v:b2b|battery-to-battery boosting charger]] that can produce correct charging voltage |
| - [[http://amzn.to/2gVwmKw|solid state isolator]] - an electronic device which uses diodes to prevent depletion of the starter battery. **Isolators are generally brick-shaped**. Diode-based isolators have a **0.5v - 1v drop** between the alternator and house battery. This may be desirable if the house battery is a lower-voltage chemistry like [[electrical:12v:lifepo4_batteries_thread|LiFePO4]]. Some solid state isolaters use FETs and diodes in tandem to reduce voltage drop. \\ Note: solid state relays can't combine batteries for self-jumpstarting. | - [[http://amzn.to/2gVwmKw|solid state isolator]] - an electronic device which uses diodes to prevent depletion of the starter battery. **Isolators are generally brick-shaped**. Diode-based isolators have a **0.5v - 1v drop** between the alternator and house battery. This may be desirable if the house battery is a lower-voltage chemistry like [[electrical:12v:lifepo4_batteries_thread|LiFePO4]]. Some solid state isolaters use FETs and diodes in tandem to reduce voltage drop. \\ Note: solid state relays can't combine batteries for self-jumpstarting. |
| - manual switch - A [[http://amzn.to/2gsDtNc|manual battery switch]] normally has 4 positions: A, B, A+B, and Off. A would be for the starter battery and used during starting. B would be used for house use when one is not driving. A+B could be used to combine both sets for starting or for charging while driving. This kind of setup is prone to user error. A manual switch has no current or voltage losses. | - manual switch - A [[http://amzn.to/2gsDtNc|manual battery switch]] normally has 4 positions: A, B, A+B, and Off. A would be for the starter battery and used during starting. B would be used for house use when one is not driving. A+B could be used to combine both sets for starting or for charging while driving. This kind of setup is prone to user error. A manual switch has no current or voltage losses. |
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| | ===== sizing an isolator ===== |
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| | If an isolator is **oversized** it will cost more for no benefit and will self-consume extra energy to hold the combining circuit closed.((an electromagnet holds the parts of the active circuit together. When power to the insolator input is cut the electromagnet can no longer hold the circuit closed. The batteries are now isolated from each other.)) If an isolator is undersized (less common) it will not be able to carry enough current, overheat, and electronic models may reset or shut down. |
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| ===== gotchas ===== | ===== gotchas ===== |
