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electrical:12v:directcharginglfp [2022/09/17 18:10] frater_secessus [analysis of van-relevant installs] |
electrical:12v:directcharginglfp [2022/09/17 18:24] frater_secessus [assessing your own setup for direct alternator charging] |
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- | There is an outlier that pulls 0.67C. | + | There is an outlier that pulls 0.67C at ~10% state of charge.((spreadsheet says 25%, but a later post clarified it was in the bottom knee)) |
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- | On average, direct-charging 100Ah of LFP consumed ~22% of the alternator' | + | On average, direct-charging |
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=== lessons === | === lessons === | ||
- | Don' | + | Think twice about |
Do not idle to charge. | Do not idle to charge. | ||
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* **if isolator wiring is already present** from a previous bank, test it while using a monitor or BMS info to watch actual current. | * **if isolator wiring is already present** from a previous bank, test it while using a monitor or BMS info to watch actual current. | ||
* **if starting from scratch** there is less to go on. | * **if starting from scratch** there is less to go on. | ||
- | * In the van-relevant examples above LFP banks typically pull 0.33C, or 33A per 100Ah of capacity. | + | |
- | * LFP manufacturers typically allow up to 0.5C charging for normal use. | + | |
+ | * a set of heavy jumper cables and a clamp-on monitor | ||
If you are still interested, here is one approach to assessing your setup for direct charging lithium: | If you are still interested, here is one approach to assessing your setup for direct charging lithium: |