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opinion:frater_secessus:chariging_lithium_to_soc [2022/05/23 13:22] frater_secessus [charging approaches] |
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- | ====== Charging lithium to a specific State of Charge ====== | ||
- | Lead batteries are healthiest when they are kept 100% [[electrical: | ||
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- | 1. charge enough to make sure we can get through the night with ≥20% capacity in the bank((for longevity)); | ||
- | 1. charge so that the bank is not held at 100% SoC. | ||
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- | ===== challenges ===== | ||
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- | The balancing act is not so easy. | ||
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- | ==== solar charging is highly variable ==== | ||
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- | On a bench Li is easy to charge with an amp-counter and constant current power supply. | ||
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- | Related: | ||
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- | ==== lithium SoC and voltage ==== | ||
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- | Lithium SoC is extremely difficult to gauge by voltage. | ||
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- | Any voltage sag between the controller and battery will wildly distort whatever | ||
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- | ===== charging approaches ====== | ||
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- | Charging lithium to <100% is easy; just lower charging voltage. | ||
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- | It //is// an issue if you need to pull 30A out of the 50A bank overnight: | ||
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- | A more precise way to do it would be to use a controller that talks to a shunt and could hold the bank at a given SoC based on coulomb-counting. |