Has anyone bought the same B grade 280ah batteries from Luyuan? I chatted with Amy after noticing the spec sheets for the real A grade was the same as the B grade. She said the only difference was the self discharge rate. I then told her I needed to occasionally discharge 160ah 0.6C to meet the full load on my 8kW inverter. She spoke to her engineer who advised getting real grade A. We're all going for 280ah because they give the best bang for buck. They appear to be cheap for a reason. Any reports on the Luyuan $110 cells?
I think you would be better off with the A grade cells. If your system was utilized in a lighter manner, the B grade cells would be OK. B grade from Amy are still good stuff.