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electrical:severe_battery_use [2020/07/22 15:27]
frater_secessus [Intentionally severe battery use] 		electrical:severe_battery_use [2024/03/31 01:42] (current)
frater_secessus [Intentionally severe battery use]
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 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//. 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 severe use of lead-acid banks by running them below the 50% mark, **followed by vigorous recharging** at maximal voltage.  This might be desirable when:+This article is about the intentional severe use of lead-acid banks by running them below the 50% mark, **followed by vigorous recharging** at maximal voltage.((the high end of the acceptable Absorption range.  Maybe even EQ)).  Perhaps [[electrical:12v:eternal_absorption|forgoing Float altogether]].  This might be desirable when:
  
   * reducing the weight impact of lead banks   * reducing the weight impact of lead banks
-  * one wants to make use of old/damaged batteries whose capacity has declined+  * one wants to make use of old/damaged/unsuited batteries until replacements can be sourced
  
 ===== how low can we go? ===== ===== how low can we go? =====
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   * 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]].     * 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]].  
-  * fully charge lead-chemistry batteries as often as possible +  * fully charge lead-chemistry batteries as often as possible.  This may require [[electrical:12v:eternal_absorption|special measures to finishing Absorption]].
- +
- +
-===== increasing effective Absorption duration ===== +
- +
-Deep cycling generally extends the amount of time for a battery to complete Absorption. At some you may run into the controller's maximum Absorption duration.  While you may not be able to increase the //actual// 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 [[electrical:12v:eternal_absorption|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. +
  
  
  
electrical/severe_battery_use.1595431669.txt.gz · Last modified: 2020/10/11 23:48 (external edit)

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