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electrical:12v:alternator [2024/09/10 11:38]
frater_secessus [gotchas] 		electrical:12v:alternator [2024/12/21 11:47] (current)
frater_secessus [lithium-specific VSR]
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 An interesting 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]].
  
 +=== True Amalgamated Lithium VSR ===
  
 +True [[https://www.trueam.com/product/true-lithium-large-dual-battery-kit/|makes a VSR]] with 13.5v ON and 13.2v OFF setpoints. 
  
  
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     * [[electrical:12v:alternator#disabling_alternator_charging|disable alternator charging]] (at least momentarily) after driving     * [[electrical:12v:alternator#disabling_alternator_charging|disable alternator charging]] (at least momentarily) after driving
     * use a relay [[electrical:12v:alternator#triggering|triggered by D+]]     * use a relay [[electrical:12v:alternator#triggering|triggered by D+]]
 +    * use a relay like [[#li-bim|the Li-Bim]] with setpoints designed for LFP
     * install a voltage sensing switch to control the relay, set more appropriately for LFP's resting voltage     * install a voltage sensing switch to control the relay, set more appropriately for LFP's resting voltage
     * install [[electrical:12v:b2b|DC-DC]].      * install [[electrical:12v:b2b|DC-DC]]. 
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   * VSR triggered by voltage can can be disabled by a switch on the thin ground wire on the VSR itself.((the VSR requires a ground to make a complete circuit to run internal electronics.  Breaking this circuit turns off the  VSR))     * VSR triggered by voltage can can be disabled by a switch on the thin ground wire on the VSR itself.((the VSR requires a ground to make a complete circuit to run internal electronics.  Breaking this circuit turns off the  VSR))  
   * some DC-DC can be //derated//((output intentionally reduced)) by providing a 12v signal to the CURRENT LIMIT terminal ([[electrical:12v:b2b#renogy1|Renogy DC1212 series]], [[electrical:12v:b2b#leaptrend|Leaptrend]]) or through a setting in an app (Renogy DCC50S).   * some DC-DC can be //derated//((output intentionally reduced)) by providing a 12v signal to the CURRENT LIMIT terminal ([[electrical:12v:b2b#renogy1|Renogy DC1212 series]], [[electrical:12v:b2b#leaptrend|Leaptrend]]) or through a setting in an app (Renogy DCC50S).
-  * some DC-DC can be //disabled// by providing a 12v signal to a remote ON/OFF terminal ([[electrical:12v:b2b#victron|Victron Orion-TR]]), Kisae.  +  * some DC-DC can be //disabled// by providing a 12v signal to a remote ON/OFF terminal ([[electrical:12v:b2b#victron|Victron Orion-TR]]), [[electrical:12v:b2b#disabling_the_kisae|Kisae]].  
   * on units that have a dedicated NEG ("ground", negative return) to the starter battery there may be no easy disable method.  The brute force method would be to insert a relay between the starter battery POS and the unit's POS input, and control the relay with a switch.    * on units that have a dedicated NEG ("ground", negative return) to the starter battery there may be no easy disable method.  The brute force method would be to insert a relay between the starter battery POS and the unit's POS input, and control the relay with a switch. 
   * bluetooth-enabled DC-DC can often be disabled or derated from the app   * bluetooth-enabled DC-DC can often be disabled or derated from the app
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   - use of an ON/OFF 12v trigger signal ("D+", "IGN", "ACC").  When the 12v signal is present the charging circuit is operational.  Caveat:  in this kind of setup leaving the key in the ACC position without starting the engine can drain the starter battery.    - use of an ON/OFF 12v trigger signal ("D+", "IGN", "ACC").  When the 12v signal is present the charging circuit is operational.  Caveat:  in this kind of setup leaving the key in the ACC position without starting the engine can drain the starter battery. 
-  - voltage-sensing - 12v is always being provided to the charger.  The batteries are connected when the chassis voltage is above a voltage setpoint (often ≥13.4v) and disconnected when the chassis side measures below  a setpoing (often ≤13.2v).  +  - voltage-sensing - 12v is always being provided to the charger.  The batteries are connected when the chassis voltage is above a voltage setpoint (often ≥13.4v) and disconnected when the chassis side measures below  a setpoint (often ≤13.2v).  
  
-In some cases both are combined for particular installs.  Ex.  smart alternators. +In some cases both voltage-sensing and D+ trigger are combined to work with the odd voltages that smart alternator equipped vehicles can present. 
  
  
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 A simple possible approach would be to [[electrical:solar:shallow_cycling|replace the starter battery with a marine or AGM battery]].((http://www.cheaprvliving.com/forums/Thread-Easiest-simplest-cheapest-power-set-up)) A simple possible approach would be to [[electrical:solar:shallow_cycling|replace the starter battery with a marine or AGM battery]].((http://www.cheaprvliving.com/forums/Thread-Easiest-simplest-cheapest-power-set-up))
  
-===== charging trailer batteries =====+===== charging remote batteries ===== 
 + 
 +==== truck beds ==== 
 + 
 +If the bed does not have sufficient ground connectivity to run the NEG return through the body, then you can either: 
 + 
 +  * add an additional and/or beefier ground strap between bed and frame; or 
 +  * run a dedicated NEG return from the bank back to the starter batt, frame, etc.  
 + 
 + 
 + 
 + 
 +==== trailers ==== 
  
 Some amount of power can be passed along the 7pin harness, usually enough to //maintain// the trailer battery's voltage and run small loads.  For the purposes of this discussion [[https://www.etrailer.com/faq-wiring-7-way.aspx|the important wires]] in the 7-pin are: Some amount of power can be passed along the 7pin harness, usually enough to //maintain// the trailer battery's voltage and run small loads.  For the purposes of this discussion [[https://www.etrailer.com/faq-wiring-7-way.aspx|the important wires]] in the 7-pin are:
electrical/12v/alternator.1725982693.txt.gz · Last modified: 2024/09/10 11:38 by frater_secessus

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