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electrical:12v:alternator [2022/12/08 13:47]
frater_secessus [voltage-sensing relays] |
electrical:12v:alternator [2022/12/19 12:05]
frater_secessus [alternator current rating] |
| ==== alternator current rating ==== | ==== alternator current rating ==== |
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| {{ https://img.mousetrap.net/misc/transit250alternator.jpg?150}} | |
| In general, vehicles with higher-rated alternators (150A, for example) will handle a given load better than vehicles with lower-rated alternators (60A, for example). The rating in Amps will be listed on the window sticker, often on the alternator housing itself, or can be looked up using a VIN decoder for your automaker. | In general, vehicles with higher-rated alternators (150A, for example) will handle a given load better than vehicles with lower-rated alternators (60A, for example). The rating in Amps will be listed on the window sticker, often on the alternator housing itself, or can be looked up using a VIN decoder for your automaker. |
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| There are no firm rules on how much power you can extract, but these are commonly-observed limits: | |
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| * draw no more than 1/2 of rated amps while driving at normal road speeds - this includes the vehicle's own demands (lights, wipers, fans, etc). 1/3 may be a safer rate for continuous charging. | |
| * draw no more than 1/4 of rated amps while driving at slower speeds. | |
| * [[rv:idling#charging|do not idle]] to charge house batteries | |
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| Note that alternators put out their rated current at higher RPM.((typically highway speeds)) See chart on the right for a Ford Transit 250A alternator. | |
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| See [[https://youtu.be/gDIsOaEI9Wo?t=344|this excellent video]] discussing the output of an example alternator. | |
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| * [[https://amzn.to/3FgFggW|BlueSea ML-ACR w/manual controll 7622]] - **500A**. Version of the ML-ACR above with a manual control knob((yellow knob visible on top of housing)) to override isolation or combination if desired. | * [[https://amzn.to/3FgFggW|BlueSea ML-ACR w/manual controll 7622]] - **500A**. Version of the ML-ACR above with a manual control knob((yellow knob visible on top of housing)) to override isolation or combination if desired. |
| * [[https://amzn.to/2RFaXI7|JayCorp Smart Dual Battery 140A Isolator]]((bonus points to the Jaycorp for printing the connect/disconnect setpoints right on the isolator!)) | * [[https://amzn.to/2RFaXI7|JayCorp Smart Dual Battery 140A Isolator]]((bonus points to the Jaycorp for printing the connect/disconnect setpoints right on the isolator!)) |
| * Precision Circuits [[https://www.precisioncircuitsinc.com/product/battery-isolation-manager/|BIM]]. Latching relays in **160A** and **225A** versions. . Disconnects after 1 hour max to prevent overcharging: "The BIM does not guarantee 100% battery charge, but prevents harmful battery charge levels.((https://www.precisioncircuitsinc.com/wp-content/uploads/2017/06/00-10041-2xx-Battery-Isolation-Manager-Rev7-1.pdf)) //Sig// terminal can use used for [[electrical:12v:self-jumpstarting|self-jumpstarting]] \\ Also see Li-BIM below. | * Precision Circuits [[https://www.precisioncircuitsinc.com/product/battery-isolation-manager/|BIM]]. Latching relays in **160A** and **225A** versions. . Disconnects after 1 hour max to prevent overcharging: "The BIM does not guarantee 100% battery charge, but prevents harmful battery charge levels.((https://www.precisioncircuitsinc.com/wp-content/uploads/2017/06/00-10041-2xx-Battery-Isolation-Manager-Rev7-1.pdf)) //Sig// terminal can use used for [[electrical:12v:self-jumpstarting|self-jumpstarting]]. \\ Also see Li-BIM below. |
| - DC-DC isolators (aka //[[electrical:12v:b2b|b2b]] isolators//) that boost alternator voltage to [[electrical:12v:charging|more appropriate levels for lead chemistries]] and can do multistage charging. These have [[electrical:12v:b2b|their own page]]. | - DC-DC isolators (aka //[[electrical:12v:b2b|b2b]] isolators//) that boost alternator voltage to [[electrical:12v:charging|more appropriate levels for lead chemistries]] and can do multistage charging. These have [[electrical:12v:b2b|their own page]]. |
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| The unit supports [[electrical:12v:self-jumpstarting|self-jumpstarting]] but a switch must be installed by the user. 160A and 225A models are available. BB suggests the BIM is recommended for lithium banks >= 300Ah.((https://sprinter-source.com/forums/index.php?threads/68203/post-762424)) | The unit supports [[electrical:12v:self-jumpstarting|self-jumpstarting]] but a switch must be installed by the user. 160A and 225A models are available. BB suggests the BIM is recommended for lithium banks >= 300Ah.((https://sprinter-source.com/forums/index.php?threads/68203/post-762424)) |
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| A teardown of the Li-BIM can be seen in [[https://www.youtube.com/watch?v=pFd9Uulo9rY|this video]]. | An interesting teardown of the Li-BIM can be seen in [[https://www.youtube.com/watch?v=pFd9Uulo9rY|this video]]. |
| ==== misc ==== | ==== misc ==== |
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