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opinion:frater_secessus:charging_faster

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opinion:frater_secessus:charging_faster [2023/07/15 15:05]
frater_secessus [lithium] 		opinion:frater_secessus:charging_faster [2025/10/11 14:21] (current)
frater_secessus [lead-acid]
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-**Lead batteries** have a **maximum amount of current** they will accept, typically [[electrical:12v:battery_capacity|C/3]] for AGM and C/5 for flooded. So if you have 100Ah of AGM the most it will want to take is something like ~33A.  Once the battery's limit is hit throwing more charging capacity at it can't charge it any faster.((it may help run loads, though))+**Lead batteries** have a **maximum amount of current** they will accept, typically [[electrical:12v:battery_capacity|0.33C]] for AGM and 0.2C for flooded. So if you have 100Ah of AGM the most it will want to take is something like ~33A.  Once the battery's limit is hit throwing more charging capacity at it can't charge it any faster.((it may help run loads, though))
  
 ** Deep-cycled lead batteries have a lengthy [[electrical:12v:charging|Absorption]] stage** that cannot be sped up((at least not more than a few percent, see below)). Depending on use, Absorption typically requires several hours.There is a saying that "it takes 9 months to make a baby, but two women cannot make a baby in 4.5 months".  Same with absorption - it takes what it takes and you cannot hurry it in the normal sense. ** Deep-cycled lead batteries have a lengthy [[electrical:12v:charging|Absorption]] stage** that cannot be sped up((at least not more than a few percent, see below)). Depending on use, Absorption typically requires several hours.There is a saying that "it takes 9 months to make a baby, but two women cannot make a baby in 4.5 months".  Same with absorption - it takes what it takes and you cannot hurry it in the normal sense.
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 MaineSail found that  MaineSail found that 
  
-  * charging AGM at C/2.5 (max rate) resulted in the battery being 63.3% "full"((amp-wise)) at Vabs and being fully charged in **5hrs, 30 minutes** (20min Bulk, 5hr 10mins Absorption) +  * charging AGM at 0.4C (max rate for that particular battery) resulted in the battery being 63.3% "full"((amp-wise)) at Vabs and being fully charged in **5hrs, 30 minutes** (20min Bulk, 5hr 10mins Absorption) 
-  * charging AGM at C/5 (min rate) resulted in the battery being 77.4% "full" at Vabs and being fully charged in **5hrs, 42 minutes** (76min Bulk, 4hr 26mins Absorption)+  * charging AGM at 0.2C (min rate) resulted in the battery being 77.4% "full" at Vabs and being fully charged in **5hrs, 42 minutes** (76min Bulk, 4hr 26mins Absorption)
  
 Note that the **using 2x the charging current only sped up the whole process by 12 minutes (3.6%)** due to Vabs starting earlier but taking longer.  Note that the **using 2x the charging current only sped up the whole process by 12 minutes (3.6%)** due to Vabs starting earlier but taking longer. 
opinion/frater_secessus/charging_faster.1689433529.txt.gz · Last modified: 2023/07/15 15:05 by frater_secessus

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