Author Topic: Lifepo4 charging  (Read 101 times)

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Offline CG

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Re: Lifepo4 charging
« Reply #15 on: December 18, 2020, 06:57:53 pm »
5000 mAh then took a sharp dive after that. But Im happy its not so hard to charge as I thought.

Offline Caleb

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Re: Lifepo4 charging
« Reply #16 on: December 19, 2020, 09:37:36 pm »
Impressive.  I wonder how many cycles you can get out of them.

Offline CG

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Re: Lifepo4 charging
« Reply #17 on: December 20, 2020, 07:00:42 am »
Probably not as many as advertised (2000) since my charging method is not to specifications. ::)
Also a BMS (battery managment system) probably would be required for cells in series.
Too bad a simple BMS couldn't be made from zener diodes and a mosfet somehow.
Maybe a zener diode could just be placed across the cell to limit charging voltage going too high.
But I think balancing the cells would be tricky since internal resistance could make all the cells in a battery discharge at different rates, eventually causing a cell to be reverse charged. It would require a microcontroller or human attention to keep the cells in a battery balanced. But one 3.2 volt cell at 100,000mAh could be used with a DC-DC boost converter..

   https://overkillsolar.com/product/lifepo4-cell-100ah/

Maybe.
The LiFePO4 cell is larger and heavier than a LI-ion cell.
« Last Edit: December 20, 2020, 05:49:46 pm by CG »

Offline Caleb

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Re: Lifepo4 charging
« Reply #18 on: December 21, 2020, 07:50:30 am »
Six pounds and almost as much energy storage as a 60 pound deep cycle lead acid battery.  Very nice!

Offline CG

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Re: Lifepo4 charging
« Reply #19 on: December 21, 2020, 09:37:04 am »
The 6 pounds is just one 3.2v cell.  It would be 23.4 pounds for 12 volt battery. Still much lighter than lead. And no sulfation from long term storage. But $620