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--- opinion:frater_secessus:charging_faster [2020/04/27 21:08]
frater_secessus [lead-acid]
+++ opinion:frater_secessus:charging_faster [2020/06/07 18:55]
frater_secessus [lead-acid]
@@ Line 2: / Line 2: @@
-There is a common misperception that charging one's battery banks //faster// is //better// or worth throwing more money at.  Here are some reasons it is not always true:
+There is a common misperception that charging one's battery banks //faster// is //better// or that having more charging capacity guarantees faster charging.  Here are some reasons it is not always true:
 ===== lead-acid =====
@@ Line 10: / Line 11: @@
 **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))
-** Deep-cycled lead batteries have a lengthy [[electrical:12v:charging|Absorption]] stage** that cannot be sped up. 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.
 However:
@@ Line 18: / Line 19: @@
 MaineSail found that
-  * charging AGM at C/2.5 (max rate) resulted in the battery being 63.3% "full" at Vabs and being fully charged in **5hrs, 30 minutes** (20min Bulk, 5hr 10mins Absorption)
+  * 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 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)

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