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--- electrical:severe_battery_use [2020/05/13 11:37]
frater_secessus [limiting the damage]
+++ electrical:severe_battery_use [2020/06/10 13:47]
frater_secessus [increasing effective Absorption duration]
@@ Line 3: / Line 3: @@
 Lead-acid chemistries prefer light cycling and full recharge between those cycles.  Lead-acid batteries are traditional cycled to [[electrical:depth_of_discharge|50% depth of discharge]] because it offers a balance between duty life (years between failure) and bank size.(("dead lead"))  Pulling the bank below 50% DoD in emergnecies will not automatically cause damage //assuming a full charge is accomplished ASAP//.
-This article is about the intentional and chronic depletion of lead-acid banks below the 50% mark, **followed by vigorous recharging**.
+This article is about the intentional and chronic depletion of lead-acid banks below the 50% mark, **followed by vigorous recharging**.  This might be desirable when:
+  * reducing the weight impact of lead banks
+  * one wants to make use of old/damaged batteries whose capacity has declined
 ===== how low can we go? =====
@@ Line 17: / Line 20: @@
 ===== limiting the damage =====
-Deep cycles generally extend the amount of time for a battery to complete Absorption.
+Deep cycling generally extends the amount of time for a battery to complete Absorption.
   * get power back into the battery ASAP after deep discharge;  drive for [[electrical:12v:alternator|alternator charging]] or run a [[electrical:generator|generator]] to get bulk stage going.  Solar alone //might// be sufficient but it might require meaningful [[electrical:solar:overpaneling|overpaneling]].
-  * increase Absorption time, or even set Vfloat == Vabs.
-  * if flooded, keep a close watch on water levels
+===== increasing effective Absorption duration =====
+While you may not be able to increase the //actual// Absorption duration,((as when the controller setpoint is maxxed out)) you can achieve a similar effect with one or more of these techniques:
+  * if duration setpoint is maxxed then **set Vfloat == Vabs**.  Absorption duration will effectively be "until the sun goes down".
+  * **charge at a lower current** (charging minimum).  While [[opinion:frater_secessus:charging_faster|overall charging will take about the same amount of time]], Bulk's share of that time will increase and [[electrical:12v:charging#absorption|Absorption will take somewhat less time]].
+  * **charge at a higher voltage** (Vabs), this will decrease Absorption duration.  Keep a close watch on water levels for flooded batts, and also mind the max allowable voltage for AGM/Gel.

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