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electrical:12v:drop-in_lifepo4 [2024/03/18 13:29] frater_secessus [overall lithium limitations] sizing |
electrical:12v:drop-in_lifepo4 [2024/06/19 19:36] frater_secessus [chargers] |
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Other than cost, there is little downside to having a larger LiFePO4 bank.(([[electrical: | Other than cost, there is little downside to having a larger LiFePO4 bank.(([[electrical: | ||
- | * greater [[opinion: | + | * greater [[opinion: |
- | * supporting larger discharge current - [[electrical: | + | * supporting larger discharge current - [[electrical: |
* safely accepting larger charging currents when charging time is limited. | * safely accepting larger charging currents when charging time is limited. | ||
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Lithium can famously accept huge amounts of current; | Lithium can famously accept huge amounts of current; | ||
- | * Maximum((max for our drop-ins; EV packs can have much greater throughput)) - 1C (100A for 100Ah battery) | + | * Absolute maximum((max for our drop-ins; EV packs can have much greater throughput)) - 1C (100A for 100Ah battery) |
- | * Manufacturer | + | * Manufacturer |
- | * cycle rating (longest life) - 0.2C (20A for 100Ah battery) | + | * recommended / cycle rating (longest life) - 0.2C (20A for 100Ah battery) |
Lithium does not have a minimum charging current in the lead-battery sense. | Lithium does not have a minimum charging current in the lead-battery sense. | ||
+ | If you choose to end Absorption based on current, you might start out with [[electrical: | ||
=== voltage === | === voltage === | ||
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* to top-balance cells((to the degree this works)) | * to top-balance cells((to the degree this works)) | ||
+ | ==== myth: lithium batteries draw the full current until they are almost full ==== | ||
+ | |||
+ | |||
+ | * both lead and li chemistry charge acceptance [[electrical: | ||
+ | * both will charge ~at [[electrical: | ||
+ | |||
+ | If we observed closely we //would// see some differences: | ||
==== myth: if you don't charge to 14.4v the cells won't balance ==== | ==== myth: if you don't charge to 14.4v the cells won't balance ==== | ||
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=== testing your isolator with Li === | === testing your isolator with Li === | ||
- | see [[electrical: | + | see [[electrical: |
==== but that Victron video ==== | ==== but that Victron video ==== | ||
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>> For belt-and-suspenders you could add a $10 12v temp controller or NO thermal switch in series [with the disabling method]. | >> For belt-and-suspenders you could add a $10 12v temp controller or NO thermal switch in series [with the disabling method]. | ||
+ | |||
+ | Note that some chargers have built-in low-temp charging cutoff already. | ||
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Some batteries have BMS with bluetooth or other forms of connectivity. | Some batteries have BMS with bluetooth or other forms of connectivity. | ||
+ | Having visibility into the state of the BMS/cells might be useful for tech geeks, but often muddies the waters for non-technical customers. | ||