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electrical:12v:charging [2019/10/01 13:01] frater_secessus [charging other chemistries] |
electrical:12v:charging [2020/01/13 11:00] frater_secessus [temperature compensation] |
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==== absorption stage ==== | ==== absorption stage ==== | ||
- | The absorption stage, sometimes called // | + | The absorption stage, sometimes called // |
- | Absorption **begins when the battery reaches the absorption voltage** ([[electrical: | + | Absorption **begins when the battery reaches the absorption voltage** ([[electrical: |
+ | |||
+ | Example: | ||
+ | |||
+ | |||
+ | In practice absorption takes longer when the battery has been discharged deeply and shorter when it has not.((http:// | ||
Some controllers will allow the user to configure the time or ratio of capacity/ | Some controllers will allow the user to configure the time or ratio of capacity/ | ||
- | > If your charge controller only holds [absorption] voltage for an hour or two, that is likely not enough time. As long as [there is a load] and you cycle the battery daily, you could set float voltage to 14.8v [to match absorption] without worry. Only when you stop cycling the battery do you need to return float voltage to more regular 13.2v levels. Premature application of float voltage by automatic charging sources is a battery killer.((http:// | + | > If your charge controller only holds [absorption] voltage for an hour or two, that is likely not enough time. As long as [there is a load] and you cycle the battery daily, you could set float voltage to 14.8v((for example - secessus)) |
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==== float stage ==== | ==== float stage ==== | ||
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- ambient temperature as measured by the charger. | - ambient temperature as measured by the charger. | ||
- in the absence of actual measurements the charger will likely use the 77F laboratory standard. | - in the absence of actual measurements the charger will likely use the 77F laboratory standard. | ||
+ | |||
+ | This automatic voltage tweaking for temperature may result in your actual battery voltages being observably higher in cold temps and lower in hot temps. | ||
===== watering batteries ====== | ===== watering batteries ====== |