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electrical:depth_of_discharge [2023/08/17 21:05] frater_secessus [estimating SoC while resting] |
electrical:depth_of_discharge [2023/08/17 21:22] frater_secessus [knowing when SoC is 100% (fully charged)] |
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* at moderate charging rates and voltages between ≥13.4v and <13.8v SoC will be ~100% after some amount of Absorption. | * at moderate charging rates and voltages between ≥13.4v and <13.8v SoC will be ~100% after some amount of Absorption. | ||
+ | ==== soft and firm charging ==== | ||
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+ | Solar is typically a moderate (or " | ||
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+ | So while we can say with confidence that a 100Ah Li battery charged at 20A to 14.0v will be ~100% SoC, the same battery charged to 14.0v at 80A might only be at 75% SoC. The amp counter will probably help here during charging. | ||
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{{ http:// | {{ http:// | ||
- | A rested (no load), fully charged, unFloated lead battery will be 100% around 12.7v-12.8v; | + | A rested (no load), fully charged, unFloated lead battery will be 100% around 12.7v-12.8v; |
The famous chart to the right is used to estimate SoC of a rested battery after a full charge. | The famous chart to the right is used to estimate SoC of a rested battery after a full charge. | ||
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A rested (no load), fully charged, unFloated lithium battery will be 100% around 13.5-13.6v. | A rested (no load), fully charged, unFloated lithium battery will be 100% around 13.5-13.6v. | ||
+ | As we will see below SoC-by-voltage will appear to be **artificially high during charging**((voltage rise)) and **artificially low during discharging**((voltage sag)). | ||
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* intermittent heavier loads that leave the system with measured >=12.2v when that load is removed | * intermittent heavier loads that leave the system with measured >=12.2v when that load is removed | ||
- | The more challenging task is judging | + | ===== estimating SoC while discharging ===== |
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+ | The more challenging task is judging | ||
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+ | Consider this chart for Trojan FLA batteries: | ||
{{ https:// | {{ https:// | ||
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If the battery rebounds to the desired voltage then repeat to deeper discharge. | If the battery rebounds to the desired voltage then repeat to deeper discharge. | ||
- | An [[electrical: | + | |
+ | **Lithium batteries** also exhibit voltage sag under load but typically much less than AGM or especially FLA. | ||
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+ | ===== estimating SoC while charging ===== | ||
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+ | Similar to voltage sag during discharge, batteries exhibit voltage //surge// or //rise// during charging. | ||