I am already going to buy a massive pile of 20Ah LiFePO4 (100A continuous, 160A 10sec) for a large 12V battery I am building for a different project (PM me if you are curious). I also plan to get some extra to build an esk8 battery.
I plan to do a 16s1p setup (48-51V, 20Ah, 100A, 2000W). It is pretty much equivalent to a 12s6p or 12s7p setup with Samsung 30Q cells. That is rather large, but at $288 not unreasonable (and same price as for 72xSamsung 30Q @$4). I will also use a balancing 100A BMS (+$80).
This is probably more interesting for people who have a lot of space under their deck or who want to mount a battery block over their truck/board.
I am posting this in case anyone (ideally from Bay Area, CA) wants to join in and share shipping costs. I basically already am getting a special group buy price from the start thanks to my other project - so not a group buy, but even better price.
Thoughts?
Pros:
LiFePO4 is probably the most reliable and high cycle life chemistry
Can use standard Battery bars to connect in series
rectangular alloy encasing for heat dissipation and easy stacking
I’d love to see a super long range, FAST, AT board made with these. One layer stacked width wise vertically … ill just show you. 16S2P, on a haya lid, top side could have been trimmed back to make more room for feet comfortably but eh i’m tired.
Mmmmm! 200A with up to 320A burst, 2048 watt hours…
Dude! Nice design! Yeah, that would make… an EV, essentially.
What about having a more square pack up front and another in the back, with the cells upright, two or three wide? Like this you could use a lower deck and have enough room for feet if the deck is long.
Haha huge power but nowhere left to stand! Maybe stack it for a seat. Nice to see the iron batteries in the Bay Area though. Maybe could stand on the batteries and just commit to that and go even longer
The focbox Unity HAS A MAX of 12S… Although, you are right as the other batteries that I am considering as a strong possibility is series of 18 650 s… From power tool batteries.
Doesn’t MATTER. That’s 12s of regular lithium ion (lithium polymer) cells with a maximum charge voltage of 4.2V. 4.2*12=50.4v, which is the maximum safe voltage the focbox can handle.
LiFePO4 (lithium iron phosphate, or iron as hummie called them) cells like the ones above have a maximum charge voltage of 3.6V, so you can have 16 of them and reach the same maximum safe voltage level as a 12s pack of regular li-ion.
Yes. I understand all about lithium ion just wasn’t sure if I was missing anything… Currently, trying to find someone to build me a 12s made of Samsung 30qs with high discharge rate…
40Ts are significantly larger than 30Qs, so they won’t fit in some builds. There are better-performing 18650s (VTC6 comes to mind) but they’re generally more expensive. 30Q is just a good balance of value and performance.
