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electrical:12v:charging [2020/01/07 22:16] frater_secessus [absorption stage] |
electrical:12v:charging [2020/06/23 13:56] frater_secessus |
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- | [[lifestyle: | + | [[lifestyle: |
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+ | > “Three stage chargers are easier on your batteries, charge them faster, fuller and help you use less water”((https:// | ||
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+ | > A [ [[electrical: | ||
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+ | > Charging lead acid batteries is not something that you decide to do, or start or stop. The old statement, "I need to idle the engine for a few minutes to "top off" the batteries." | ||
====== charging deep cycle batteries ====== | ====== charging deep cycle batteries ====== | ||
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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: |
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+ | Example: | ||
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+ | In practice absorption takes longer when the battery has been discharged deeply and shorter when it has not.((http:// | ||
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+ | **Mythbuster: | ||
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+ | > charge current affects the SOC transition point from bulk to absorption charging - MaineSail((https:// | ||
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+ | MaineSail found that | ||
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+ | * charging AGM at C/2.5 (max rate) resulted in the battery being 63.3% " | ||
+ | * charging AGM at C/5 (min rate) resulted in the battery being 77.4% " | ||
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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((for example - secessus)) [to match absorption] without worry. Only when you stop cycling the battery do you need to return float voltage to more regular 13.2v((for example - secessus)) 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)) [to match absorption] without worry. Only when you stop cycling the battery do you need to return float voltage to more regular 13.2v((for example - secessus)) levels. Premature application of float voltage by automatic charging sources is a battery killer.((http:// | ||
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+ | If Absorption cannot be completed in the max amount of time configurable in the controller (due to damaged/old batteries), **charging at the minimum rate and/or at higher voltage may help [[electrical: | ||
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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. | ||
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+ | 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 ====== | ||
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**Manual chargers** will not be affected by load as they are controlled by the user. | **Manual chargers** will not be affected by load as they are controlled by the user. | ||
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+ | ===== battery voltage while charging ===== | ||
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+ | Battery Voltage = Battery Voc((resting voltage)) + (Charge Current x Ri((internal resistance))) | ||