Easter
presuming those cells from batteryspace are exact size of original Eplus cells.
I dont have any left so I cannot check.
they are 15A max discharge so 3C , not bad
BUT
China manufacturers are notorious for inflated specs. and batteryspace just reprint what specs supplier provides, I am sure.
I would say they are 10 A discharge max, max
with this chemistry you need 12 in series but even 10A is too little for 1000W Eplus
you need 3 strings of 12 cells to paraller to allow 30A draw.
so 12 in series 3 pallarel combination = 36 cells
if you do 2 strings of 12 cells - those cells would work hard and not last long.
you have only room for 30 cells