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BAE-200 Powerwall
#21
Hi . I have 90 of these A123 40v packs. Do not use the bms it is only a high cell burner. Check out my youtube channel..

(06-05-2019, 03:25 PM)FrankZ Wrote: Hi . I have 90 of these A123 40v packs. Do not use the bms it is only a high cell burner. Check out my youtube channel..



(08-26-2018, 05:51 AM)Solexx X Wrote:
(08-24-2018, 05:49 PM)Crimp Daddy Wrote: If you are mixing 14s Lithium Ion and 16s LiFePO4 in parallel, they should be ok together, but I wouldn't let it run wild without testing on both the top end and bottom end of the voltage range to make sure everything agrees.

Using an APC you don't really have much customization of charge termination voltages so do keep a close eye.  Personally I would want to limit both the top end and bottom voltages to try and extend life of the cells and give myself a little runway for saftey.

If you have a multimeter with a USB logging capability or a few CellLog that actually record data, you can capture what is happening during the APCs max charging and float voltages assuming you are charging using the APC and not just using it as an inverter.

No mixing on the same system. Really bad idea. Each system will need their own charge controller and inverter or you will lose capacity to the lowest denominator. This simple math fellas.  Is it possible? Theoretically yes. is it smart? Fuck no.

Id agree. No mixing. Lipo charge and hold voltage .Lifepo4 are like lead acid and have a CC. CV charge . After charging your lipos will continue to charge the Lifepo4 until they reach the float voltage of the Lifepo4s around 3.45/cell.
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#22
That does not sound correct… LiFePO4 is not like lead acid at all.  All lithium chemistries including LiPo, Li-Ion, LiFePO4 have CC/CV charge profiles… lead acid does not.
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#23
(06-05-2019, 05:24 PM)Crimp Daddy Wrote: That does not sound correct… LiFePO4 is not like lead acid at all.  All lithium chemistries including LiPo, Li-Ion, LiFePO4 have CC/CV charge profiles… lead acid does not.

How does lead acid not . A 12v battery is charged at 14.8 constant current until 14.8 is reached then constant voltage until 1A or so then float the rest of the day.  My A123 calls for this charge as well. My lipos do not float at all because the CV is the cutoff and the voltage does not drop from that cutoff. Do you know what I mean?
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