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electrical:12v:deep_cycle_battery [2022/03/15 14:09] frater_secessus [Lithium chemistries] |
electrical:12v:deep_cycle_battery [2023/10/27 12:30] frater_secessus [Deep cycle batteries] |
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**Note: This article assumes useage of 12v lead chemistries.** If you're using Lithium, this information is not as applicable. | **Note: This article assumes useage of 12v lead chemistries.** If you're using Lithium, this information is not as applicable. | ||
- | ---- | + | ===== specs ===== |
+ | |||
+ | * Ah (Amp-hours) | ||
+ | * Wh (Watt-hours) | ||
+ | * 100Ah of lead is 1200Wh (100Ah x 12.0v). | ||
+ | * 100Ah of LiFePO4 is 1280Wh (100Ah x 12.8v) | ||
+ | * cycles - the number of times the battery can be charged and discharged before being considered End Of Life.((EoL is typically considered the point where the battery can no longer produce 80% of its rated output)). | ||
+ | * Lead is typically rated at the 1/20th the current as Ah (5A for a 100Ah battery) down to 50% DoD. | ||
+ | * LiFePO4 is typically rated at the 1/5th the current as Ah (20A for a 100Ah battery) down to 80% DoD. | ||
+ | * both maximum and recommended charge/ | ||
+ | |||
+ | |||
===== Popular Deep-Cycle Lead batteries ===== | ===== Popular Deep-Cycle Lead batteries ===== | ||
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+ | === watering FLA === | ||
+ | - check to ensure plates are at least //covered// with liquid | ||
+ | - charge fully | ||
+ | - check water level again, adding to fill mark | ||
+ | |||
+ | This order is important because the electrolyte expands a bit as it charges, so filling completely //then// charging could result in spillage and loss of acid. | ||
==== VRLA - Valve Regulated Lead Acid ==== | ==== VRLA - Valve Regulated Lead Acid ==== | ||
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* no outgassing under normal conditions | * no outgassing under normal conditions | ||
* CON | * CON | ||
- | * generally **double the cost** of FLA for about 20% less capacity((http:// | + | * generally **double the cost** of FLA for similar |
* Premium AGM need **much more charging current** than flooded, and it may be more than solar-only setups can provide.((http:// | * Premium AGM need **much more charging current** than flooded, and it may be more than solar-only setups can provide.((http:// | ||
* even cheap AGM require more current than flooded: | * even cheap AGM require more current than flooded: | ||
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This type of VRLA battery gelatinizes the electrolyte with SiO2 (silicon dioxide) to stabilize it. While renowned for their exceptional duty cycle life, they are rarely used in campers due to cost, limited charging max similar to flooded((C/ | This type of VRLA battery gelatinizes the electrolyte with SiO2 (silicon dioxide) to stabilize it. While renowned for their exceptional duty cycle life, they are rarely used in campers due to cost, limited charging max similar to flooded((C/ | ||
- | "Lead crystal" | + | === lead crystal === |
+ | |||
+ | These appear to be an AGM variant with some gel: | ||
+ | |||
+ | >> The plate group was taken apart, which showed that the separator is a standard AGM (absorbent glass mat) with double layer. Additionally, | ||
+ | |||
+ | The "Lead crystal" | ||