opinion:frater_secessus:self-heated_lifepo4
Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision Next revision | Previous revision | ||
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opinion:frater_secessus:self-heated_lifepo4 [2025/06/24 18:48] frater_secessus [charging cutoff] |
opinion:frater_secessus:self-heated_lifepo4 [2026/10/03 20:07] (current) frater_secessus [Self-heated vs DIY warming] |
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| Line 1: | Line 1: | ||
| DRAFT | DRAFT | ||
| - | ====== | + | ====== |
| ===== TLDR ===== | ===== TLDR ===== | ||
| - | * LiFePO4 cannot be charged when the cells are below ~freezing, or discharged | + | * LiFePO4 cannot be charged when the cells are below ~freezing, or even discharged |
| - | * some kind of warming is required before charging | + | * therefore when cells are at ~freezing temps some kind of warming is required before charging |
| * self-heated: | * self-heated: | ||
| - | * DIY: more control, more charging under certain conditions, usually cheaper | + | |
| - | * in practice, warming is combined with other forms of protection: | + | * in practice, warming is combined with other forms of protection: |
| ===== how the approaches work ===== | ===== how the approaches work ===== | ||
| Line 127: | Line 127: | ||
| - | === backing into a minimum temperature setpoint === | + | ==== backing into a minimum temperature setpoint |
| - | There are a couple steps here: | + | There are two pieces of information needed |
| - | == what the datasheet tells us == | + | === what the datasheet tells us === |
| The cells inside [[electrical: | The cells inside [[electrical: | ||
| Line 143: | Line 143: | ||
| | 10°C T <15°C | 0.2C | | 10°C T <15°C | 0.2C | ||
| | 15°C T <45°C | 0.5C | | 15°C T <45°C | 0.5C | ||
| - | | 45°C T <55°C | 0.2C | | + | | 45°C T <55°C | 0.2C | |
| | >55°C | No charging allowed | | >55°C | No charging allowed | ||
| - | == C rate at full charging power == | + | === C rate at full charging power === |
| - | In secessus' | + | In secessus' |
| - | == putting it all together == | + | === putting it all together |
| - | Because his charge rate can reach **0.2C** he chose a warming | + | Because his charge rate can reach **0.2C** he chose a warming |
opinion/frater_secessus/self-heated_lifepo4.1750790898.txt.gz · Last modified: 2025/12/24 22:52 (external edit)
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