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electrical:severe_battery_use [2020/06/10 13:50] frater_secessus [limiting the damage] |
electrical:severe_battery_use [2024/03/30 21:42] (current) frater_secessus [Intentionally severe battery use] |
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//. |
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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: | 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: |
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* 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 |
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===== 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]]. |
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===== increasing effective Absorption duration ===== | |
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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: | |
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* 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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