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electrical:batterycide [2020/07/21 12:42]
frater_secessus [murdering flooded lead-acid] |
electrical:batterycide [2021/06/03 12:36]
frater_secessus [murdering flooded lead-acid] |
| //Battery murder// (or //Batterycide//) is the murder of batteries by newbs (new users), poor quality chargers, etc. The term is commonly used by SternWake: //"my goal here is to prevent batterycide."//((http://www.cheaprvliving.com/forums/Thread-Intro-Solar-Questions?pid=192042#pid192042)) | //Battery murder// (or //Batterycide//) is the murder of batteries by newbs (new users), poor quality chargers, etc. The term is commonly used by SternWake: //"my goal here is to prevent batterycide."//((http://www.cheaprvliving.com/forums/Thread-Intro-Solar-Questions?pid=192042#pid192042)) |
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| It is so common for new RVers to wreck their first set of house batteries that some recommend using cheap Costco golf cart 6v batteries or [[electrical:12v:deep_cycle_battery#chain_store_batteries|wally world batteries]] as sacrificial lambs to the learning process.((http://www.cheaprvliving.com/forums/Thread-Putting-together-system?pid=176052#pid176052)) As the RVers learns more they would invest in better quality batteries. | It is so common for new RVers to wreck their first set of house batteries that some recommend using cheap [[electrical:12v:deep_cycle_battery#chain_store_batteries|wally world batteries]] as sacrificial lambs to the learning process.((http://www.cheaprvliving.com/forums/Thread-Putting-together-system?pid=176052#pid176052)) As the RVers learns more and gets charging set up correctly they would invest in better quality batteries and have them last several years. |
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| ===== murdering flooded lead-acid ===== | ===== murdering flooded lead-acid ===== |
| * leaving them at [[electrical:12v:psoc|partial state of charge]], resulting in //irreversible// sulfation((AKA "hard" sulfation. The battery undergoes "soft" sulfation and desulfation during normal charging/discharging.)) Fully charging each day is optimal. Fully charging //almost// every day is acceptable. | * leaving them at [[electrical:12v:psoc|partial state of charge]], resulting in //irreversible// sulfation((AKA "hard" sulfation. The battery undergoes "soft" sulfation and desulfation during normal charging/discharging.)) Fully charging each day is optimal. Fully charging //almost// every day is acceptable. |
| * not charging at [[electrical:solar:charge_controller_setpoints|manufacturer-recommended Absorption voltage]] (Vabs) to reverse normally-occurring ("soft") sulfation. This is most commonly caused by [[electrical:12v:alternator|isolator-only]] charging since the house bank is being charged at ((or slightly below)) alternator voltage. \\ Less commonly, [[electrical:solar|Solar]]-only charging can cause this problem if the [[electrical:solar:sizing|battery capacity is too great for the solar output]].((http://support.rollsbattery.com/support/solutions/articles/5964-battery-sulfation)) | * not charging at [[electrical:solar:charge_controller_setpoints|manufacturer-recommended Absorption voltage]] (Vabs) to reverse normally-occurring ("soft") sulfation. This is most commonly caused by [[electrical:12v:alternator|isolator-only]] charging since the house bank is being charged at ((or slightly below)) alternator voltage. \\ Less commonly, [[electrical:solar|Solar]]-only charging can cause this problem if the [[electrical:solar:sizing|battery capacity is too great for the solar output]].((http://support.rollsbattery.com/support/solutions/articles/5964-battery-sulfation)) |
| * not holding Vabs for sufficient duration so that absorption current drops to manufacturer-recommended levels. [[electrical:generator#charging_batteries|Generator-]] or [[electrical:12v:b2b|DC-DC charging]] can cause this unless the charger runs the necessary number of hours it takes to complete Absorption. | * not holding Vabs for [[electrical:severe_battery_use#increasing_effective_absorption_duration|sufficient duration]] so that absorption current drops to manufacturer-recommended levels. [[electrical:generator#charging_batteries|Generator-]] or [[electrical:12v:b2b|DC-DC charging]] can cause this unless the charger runs the necessary number of hours it takes to complete Absorption. |
| * discharging too deeply. Maximum discharge is typically limited to 50% [[electrical:depth_of_discharge|depth of discharge]]. | * discharging too deeply. Discharge with lead-chemistries is typically limited to 50% [[electrical:depth_of_discharge|depth of discharge]] as a compromise between cycle life and bank size. |
| * allowing the cells to get low on distilled water. Check them 1x/month or so until you learn their personality. | * allowing the cells to get low on distilled water. Check them 1x/month or so until you learn their personality. |
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| ===== murdering AGM ===== | ===== murdering AGM ===== |
| AGM have benefits but are easier to murder. | [[opinion:frater_secessus:the_case_for_agm|AGM have benefits]] but are easier to murder. |
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| | * the lead-acid list above((except the part about low water levels)) |
| * overvoltage | * overvoltage |
| * Incorrect Absorption setpoints. AGM is commonly Absorped at <= 14.4v while FLA is commonly Absorped higher (at 14.7v-14.8v). Check your manufacturer's recommendation and do not exceed it. Overvoltage causes irrepairable damage by outgassing, and AGM cannot be topped off again like FLA. | * Incorrect Absorption setpoints. AGM is commonly Absorped at <= 14.4v while FLA is commonly Absorped higher (at 14.7v-14.8v). Check your manufacturer's recommendation and do not exceed it. Overvoltage causes irrepairable damage by outgassing, and AGM cannot be topped off again like FLA. |
| * Equalization. **Do not equalize AGM**!((lifeline excepted)). | * Equalization. **Do not equalize AGM**!((lifeline excepted)). |
| * Low current charging. Cheap AGM require [[electrical:12v:battery_capacity|C/5]] current minimum in Bulk, and expensive ones require C/3. | * Low current charging. Cheap AGM require [[electrical:12v:battery_capacity|C/5]] current minimum in Bulk, and expensive ones require C/3. |
| * the lead-acid list above | |
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