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opinion:frater_secessus:self-heated_lifepo4 [2023/09/03 16:17] frater_secessus [perfect storm for DIY warming] |
opinion:frater_secessus:self-heated_lifepo4 [2023/09/03 16:24] frater_secessus [robust charging] |
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- | ===== perfect storm for self-heated | + | ===== when self-heated |
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+ | When you want a packaged solution. | ||
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+ | If you run your bank very low habitually((stop doing that!)) and the warming load is enough to trigger BMS discharge shutdown. | ||
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+ | ===== when DIY warming might be preferable ===== | ||
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+ | ==== robust charging ==== | ||
With robust charging (alternator and/or bigger solar) there can be charging opportunities lost with self-heated batteries in freezing conditions. | With robust charging (alternator and/or bigger solar) there can be charging opportunities lost with self-heated batteries in freezing conditions. | ||
- | Imagine | + | Imagine |
- | * freezing overnights followed by a half-hour drive in the morning with a 30A DC-DC. | + | |
- | * a battery with warming pad that consumed 60Wh overnight to stay above freezing, vs | + | * a battery with warming pad that consumed 60Wh overnight to stay above freezing, vs |
- | * a self-heating battery that is below freezing in the morning | + | * a self-heating battery that is below freezing in the morning |
The externally warmed bank accepts current immediately and takes **15Ah of recharge**. | The externally warmed bank accepts current immediately and takes **15Ah of recharge**. | ||
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With 50A charging it's 260Wh net vs 107Wh net. . | With 50A charging it's 260Wh net vs 107Wh net. . | ||
- | If one was charging by alternator only and only driving to/from work while stealthing in freezing weather it's conceivable the self-heated batt would get *never get charged at all* because it wouldn' | + | If one was charging by alternator only and only driving to/from work while stealthing in freezing weather it's conceivable the self-heated batt would get //never get charged at all// because it wouldn' |
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+ | ==== specific configurations ==== | ||
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+ | You may want more control over the temperature setpoints. | ||
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+ | Note from Secessus: | ||