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opinion:frater_secessus:self-heated_lifepo4
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| Both sides previous revision Previous revision Next revision | Previous revision | ||
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opinion:frater_secessus:self-heated_lifepo4 [2023/09/03 16:22] frater_secessus [when self-heated might be preferable] |
opinion:frater_secessus:self-heated_lifepo4 [2023/10/17 15:13] (current) frater_secessus [how the approaches work] |
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| - allow incoming power only to the internal heaters, typically ~60w | - allow incoming power only to the internal heaters, typically ~60w | ||
| - when cell temps are > | - when cell temps are > | ||
| - | - optional: | + | - optional: |
| This means //warming only happens when charging is present// | This means //warming only happens when charging is present// | ||
| Line 34: | Line 34: | ||
| - | With " | + | With " |
| - | + | ||
| - | In some specific use cases one approach might be better-suited than the other. | + | |
| Line 53: | Line 51: | ||
| 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**. | ||
| Line 65: | Line 63: | ||
| 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' |
| ==== specific configurations ==== | ==== specific configurations ==== | ||
| Line 80: | Line 78: | ||
| * how much charging would I miss out on because the bank is taking only 60w to run the heaters instead of taking everything I can throw at it?; and | * how much charging would I miss out on because the bank is taking only 60w to run the heaters instead of taking everything I can throw at it?; and | ||
| - | * how does this compare to the Wh required to keep the bank above freezing when no charging is present? | + | |
| - | | + | * do I need greater configurability than the built-in heater allows? |
| + | * do I have the interest or ability to DIY? | ||
| ===== further reading ===== | ===== further reading ===== | ||
opinion/frater_secessus/self-heated_lifepo4.1693772529.txt.gz · Last modified: 2023/09/03 16:22 by frater_secessus
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