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opinion:frater_secessus:endamps [2021/05/05 11:34] frater_secessus [What does that mean?] |
opinion:frater_secessus:endamps [2021/05/05 11:54] frater_secessus [WTF does that even mean?] |
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Note: Flooded, AGM and gel are all types of lead-chemistry battery. | Note: Flooded, AGM and gel are all types of lead-chemistry battery. | ||
- | ====== How do I know when my lead battery fully charged? ====== | + | ====== How do I know when my lead battery |
Lead batteries are [[electrical: | Lead batteries are [[electrical: | ||
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So how do we know when the battery is fully charged? | So how do we know when the battery is fully charged? | ||
- | **A lead battery is charged when acceptance at Absorption voltage has dropped to a specified value.** | + | **A lead battery is charged when acceptance at Absorption voltage has dropped to a small fraction of its rated capacity.** |
- | ===== What does that mean? ===== | + | ===== WTF does that even mean? ===== |
Let's break it down. | Let's break it down. | ||
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> A lead battery is charged when acceptance | > A lead battery is charged when acceptance | ||
- | // | + | // |
- | Example: the charger(([[electrical: | + | Example: the charger is putting out 10A. Loads (laptop, lights) are consuming 6A. The bank's acceptance is 4A. (10A - 6A - 4A). It //must// be; chargers only put out what the system will take.((or else voltage would keep rising)) |
The presence of loads can make assessing acceptance tricky, which is why we watch current going in/out of the bank with a [[electrical: | The presence of loads can make assessing acceptance tricky, which is why we watch current going in/out of the bank with a [[electrical: | ||
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- | > has dropped to a specified level. | + | > has dropped to a small fraction of its rated capacity |
- | This is where the battery monitor shines. | + | Lead battery manufacturers typically specify Absorping until acceptance is some small percentage of [[electrical: |
- | + | ||
- | These values can be expressed in different forms but they all mean the same thing: | + | |
^ fraction | ^ fraction | ||
| C/200 - C/100 | 0.5% - 1% of C | 0.005C - 0.010C | | C/200 - C/100 | 0.5% - 1% of C | 0.005C - 0.010C | ||
+ | |||
+ | As you can see the Amps in question are quite small; | ||
+ | |||
+ | |||
+ | ===== putting it all together ===== | ||
+ | |||
+ | Battery X (100Ah) is fully charged when the battery is only accepting 0.5A to 1A at 14.5v.((Totally made-up example. | ||
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A deep-cyle battery discharged to 50% typically takes [[opinion: | A deep-cyle battery discharged to 50% typically takes [[opinion: | ||
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- | ===== putting it all together ===== | ||
- | |||
- | Battery X (100Ah) is fully charged when the battery is only accepting 0.5A to 1A at 14.5v. | ||