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--- electrical:severe_battery_use [2018/03/20 13:12]
frater_secessus created
+++ electrical:severe_battery_use [2024/03/30 21:42]
frater_secessus [Intentionally severe battery use]
@@ Line 1: / Line 1: @@
 ====== Intentionally severe battery use ======
-Lead-acid chemistries prefer light cycling and full recharge between those cycles.  Infrequent excursions below the [[electrical:depth_of_discharge|50% depth of discharge]] norm will not cause much damage assuming a full charge is accomplished ASAP afterwards.
+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.
+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
+  * one wants to make use of old/damaged/unsuited batteries until replacements can be sourced
 ===== how low can we go? =====
-The most common low-end targets for [[electrical:12v:lvd|low voltage disconnect]] are:
+For folks willing to trade battery longevity for some amount of increased capacity, common low-end targets for [[electrical:12v:lvd|low voltage disconnect]] are:
+  * 60% DoD / 40% SoC, ~12.0 rested volts
   * 75% DoD / 25% SoC, ~11.7 rested volts
   * 80% DoD / 20% SoC, ~11.6 rested volts
-===== limiting the damage =====
+===== limiting the damage =====
-Deep cycles generally extend the amount of time for a battery to complete Absorption.  Extend the
+  * 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.  This may require [[electrical:12v:eternal_absorption|special measures to finishing Absorption]].

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