Surplus LiFePO4 packs 4KWH 24V 220AH.

[pullin-gs]

Designed for powerwall applications......
8-cells: Each cell is 220ah and about 20lbs.
Would powerwall LiFePO4 prismatic cells work OK for EV auto applications?
24V at 4KWH.....two packs would deliver 8KWH @ about 300lbs.

 

[john61ct]

Not very well.

Where are you located?

 

[Honk]

LiFePO4 has no real advantage over e'g NCM cells.
Neither at weight, capacity or price.
LiFePO4 had its glory days but we are far past that time now and looking forward to even better chemistries.

 

[john61ct]

Balderdash.

Much safer, and 10x the lifespan.

LTO even more so.

As for price, what would 2kWh cost using your favorite cells?

Yes less dense.

All depends on the use case, density is irrelevant for many.

 

[BVH]

LiFeP04 number of cycles by itself trumps all the others. Almost no self discharge another plus and safety, another plus.

 

[amberwolf]

Designed for powerwall applications......
8-cells: Each cell is 220ah and about 20lbs.
Would powerwall LiFePO4 prismatic cells work OK for EV auto applications?
24V at 4KWH.....two packs would deliver 8KWH @ about 300lbs.

assuming the volume and weight and capacity-for-their-size are not an issue for you, the first questions you must answer are:

how much current does your specific system need, continuosly, and peak (and for how long)?

how much current can these cells output continously, and peak (and for how long) without (significant) voltage sag or internal heatng?

if the latter is less than the former, *and* you can't (due to space, cost, weight, etc) put enough of them in parallel to fix that, then they aren't suitable for your specific system.

If the former is less than the latter, then they are suitable for your specific system.

 

[john61ct]

LiFeP04 number of cycles by itself trumps all the others. Almost no self discharge another plus and safety, another plus.

Well not all. check out LTO, over 10000 cycles is the norm

 

[dogman dan]

Not sure I'd even trust lifepo4 parking inside my house now. Powerwall, car, whatever.

But hell yeah, better than what set my house on fire.

To carry in a home brew electric car, a bit bulky, so be good for a truck conversion, or van. Not so hot for a VW bug or geo.

 

[john61ct]

Half the weight / space per kWh of lead, so from that POV a huge upgrade.

The other LI chemistries actually used for propulsion are IMO way too dangerous to use for DIYers building House / solar storage banks used inside a living space, especially in a mobile context.

 

[bitDad]

weight, cost, space !!!

 

[billvon]

Designed for powerwall applications......
8-cells: Each cell is 220ah and about 20lbs.

Sounds like the BYD packs. Where are you located?