Parts List (affiliate links):

EVE/Lishen 280Ah Cells: https://s.click.aliexpress.com/e/_9fYkO3

Other 280Ah Suppliers that I did not test: https://s.click.aliexpress.com/e/_ABrXW3 https://s.click.aliexpress.com/e/_AfKKRp

https://s.click.aliexpress.com/e/_9j4Zxz

https://s.click.aliexpress.com/e/_ArCe87

Daly 250A BMS: https://amzn.to/2K0PV78

Higher Quality BMS: https://www.mobile-solarpower.com/raw...

4000W PSW Giandel Inverter: https://amzn.to/3orqLxf

My new favorite 12/24V 75A battery charger: https://amzn.to/35Vdwyz

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Updates: These are new lishen 272Ah cells, not eve 280Ah. I used the barcode under the covers for verification. These cells were resleeved and had the same overpressure valve as the older eve cells, and same dimensions, and same capacity, so I figured they were Eve. But I was incorrect. Lishen are considered better than eve cells on the forum. And yes, lishun pull higher than rated capacity. 281Ah is not uncommon

The cells are now $433. I bought mine for $385 + shipping, and I used my receipt as a reference for this video.

The cells in the video have the same dimensions as eve cells, but the terminals do look different. The overpressure relief valve actually matches what is on the EVE cell data sheet: http://www.dcmax.com.tw/LF280(3.2V280Ah).pdf

And grade b usually just means scratched, but a lot of times they are used cells that are not matched (especially on aliexpress). And heavily degraded, mismatched IR. I usually assume the worst.

New update 1/9/2021: Gasification is a term used in some lithium ion literature, but gas generation is a more proper term. Sorry about that.