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electrical:severe_battery_use [2020/05/13 11:31] frater_secessus [Intentionally severe battery use] |
electrical:severe_battery_use [2021/05/05 10:55] frater_secessus [increasing effective Absorption duration] added flloat |
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 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: |
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| * reducing the weight impact of lead banks |
| * one wants to make use of old/damaged batteries whose capacity has declined |
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===== how low can we go? ===== | ===== how low can we go? ===== |
===== limiting the damage ===== | ===== limiting the damage ===== |
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Deep cycles generally extend the amount of time for a battery to complete Absorption. | |
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* get power back into the battery ASAP after deep discharge; drive for alternator charging or run a 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]]. |
* increase Absorption time, or even set Vfloat == Vabs. | * fully charge lead-chemistry batteries as often as possible |
* if flooded, keep a close watch on water levels | |
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| ===== increasing effective Absorption duration ===== |
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| 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: |
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| * 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]]. |
| * **Absorb at a higher((but still manufacturer-sanctioned)) 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. |
| * **Float at a higher((but still manufacturer-sanctioned)) voltage** (Vfloat). |
| * [[electrical:12v:alt_and_solar|supplement]] solar charging with another charging source during Bulk, allowing more time for solar to finish absorption. |
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