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electrical:12v:directcharginglfp

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electrical:12v:directcharginglfp [2024/11/22 17:47]
frater_secessus [addendum: advantages of direct charging] 		electrical:12v:directcharginglfp [2025/10/29 17:57] (current)
frater_secessus [tweaking current with resistance] emphasis
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 === why does C appear to decrease as bank size increases? === === why does C appear to decrease as bank size increases? ===
  
-Current acceptance does increase with larger bank capacities but this increase can be surprisingly small:  +All other things being equal, current acceptance //does// increase with larger bank capacities but this increase can be surprisingly small:  
  
 >> IF you have other things in the network with a much higher resistance than the batteries (such as using the frame as a ground return path), changing the resistance of the battery bank [ie, increasing capacity] can have only a small effect. --MechEngrSGH((https://www.rvforum.net/threads/charging-lithium-batteries-with-alternator.135673/post-1255460)) >> IF you have other things in the network with a much higher resistance than the batteries (such as using the frame as a ground return path), changing the resistance of the battery bank [ie, increasing capacity] can have only a small effect. --MechEngrSGH((https://www.rvforum.net/threads/charging-lithium-batteries-with-alternator.135673/post-1255460))
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 === lessons === === lessons ===
  
-  -  Think twice about  direct-charging banks that have 2-3x the capacity of your alternator's rating.   If you need to do this use [[electrical:12v:b2b|a DC-DC charger]], external regulation, or current reduction with resistance as described elsewhere in this article.+  -  Think twice about  direct-charging banks that have 2-3x the capacity of your alternator's rating.   If you need to do this use a **properly-sized** [[electrical:12v:b2b|DC-DC charger]], external regulation, [[electrical:12v:alternator_details#thermal_switches|thermal switches]], current reduction with resistance as described elsewhere in this article, etc
   - do not idle to charge.    - do not idle to charge. 
  
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->> [with lead chemistries] the battery resistance [is] the large and controlling factor, **in the case of LFP, its the wiring** and the battery resistance is inconsequential. -- MechEngrSGH((https://www.irv2.com/forums/f87/alternator-burn-out-from-lithium-batteries-558284-10.html#post6433111)) (**emphasis** added)+>> [with lead chemistries] the battery resistance [is] the large and controlling factor, **in the case of LFP**, its the wiring and the **battery resistance is inconsequential**. -- MechEngrSGH((https://www.irv2.com/forums/f87/alternator-burn-out-from-lithium-batteries-558284-10.html#post6433111)) (**emphasis** added)
  
 ==== NEG return through chassis ==== ==== NEG return through chassis ====
electrical/12v/directcharginglfp.1732297649.txt.gz ยท Last modified: 2024/11/22 17:47 by frater_secessus

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