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--- opinion:frater_secessus:endamps [2021/05/05 15:37]
frater_secessus [WTF does that even mean?]
+++ opinion:frater_secessus:endamps [2021/05/05 15:54] (current)
frater_secessus [WTF does that even mean?]
@@ Line 1: / Line 1: @@
 Note:  Flooded, AGM and gel are all types of lead-chemistry battery.
-====== How do I know when my lead battery fully charged? ======
+====== How do I know when my lead battery is fully charged? ======
 Lead batteries are [[electrical:batterycide|killed]] by 'dwellers [[electrical:12v:psoc|undercharging]] them:  not fully, and/or not often enough.  To reach the expected cycle lifetime((at a given [[electrical:depth_of_discharge|depth of discharge]])) a lead battery must be charged:
@@ Line 10: / Line 10: @@
 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? =====
@@ Line 30: / Line 30: @@
-> 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**  |
 | 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 =====
+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.))
@@ Line 45: / Line 52: @@
 A deep-cyle battery discharged to 50% typically takes [[opinion:frater_secessus:charging_faster|several hours at Vabs]] to fully recharge.
-===== putting it all together =====
-Battery X (100Ah) is fully charged when the battery is only accepting 0.5A to 1A at 14.5v.

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