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opinion:frater_secessus:endamps [2021/05/05 15:43]
frater_secessus [how long does it take?] 		opinion:frater_secessus:endamps [2021/05/05 15:54] (current)
frater_secessus [WTF does that even mean?]
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 So how do we know when the battery is fully charged?  When I have topped it off for 15 minutes from the alternator?  (bzzzt) When the controller drops to Float? (bzzzt) When it is above 12.7v?  (bzzzt) So how do we know when the battery is fully charged?  When I have topped it off for 15 minutes from the alternator?  (bzzzt) When the controller drops to Float? (bzzzt) When it is above 12.7v?  (bzzzt)
  
-**A lead battery is charged when acceptance at Absorption voltage has dropped to a specified value.**+**A lead battery is charged when acceptance at Absorption voltage has dropped to a small fraction of its rated capacity.**
  
 ===== WTF does that even mean? ===== ===== WTF does that even mean? =====
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-> has dropped to a specified level.+> has dropped to a small fraction of its rated capacity
  
-This is where the battery monitor shines.  Lead battery manufacturers typically specify Absorping until acceptance is some small percentage of [[electrical:12v:battery_capacity|bank capacity]] (C).  +Lead battery manufacturers typically specify Absorping until acceptance is some small percentage of [[electrical:12v:battery_capacity|bank capacity]] (C). These values can be expressed in different forms but they all mean the same thing:
- +
-These values can be expressed in different forms but they all mean the same thing:+
  
 ^ fraction       ^ percentage      | **decimal**      | **actual values for 100Ah bank**  | ^ fraction       ^ percentage      | **decimal**      | **actual values for 100Ah bank**  |
 | C/200 - C/100  | 0.5% - 1% of C  | 0.005C - 0.010C  | 0.5A - 1A                         | | C/200 - C/100  | 0.5% - 1% of C  | 0.005C - 0.010C  | 0.5A - 1A                         |
 +
 +As you can see the Amps in question are quite small;  this is why a battery monitor is important.  
  
  
 ===== putting it all together ===== ===== putting it all together =====
  
-Battery X (100Ah) is fully charged when the battery is only accepting 0.5A to 1A at 14.5v.  +Battery X (100Ah) is fully charged when the battery is only accepting 0.5A to 1A at 14.5v.((Totally made-up example.  Follow the charging specs your battery manufacturer publishes.))
  
  
opinion/frater_secessus/endamps.1620229381.txt.gz · Last modified: 2021/05/05 15:43 by frater_secessus

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