I have to wait for batteries before start building the system, yes there are many different WZRELB inverter and the famous one is for $300. Of cource 280ah is bettrr choice but that if you can afford to buy 16 of them, any system lower that 48v will be like a bottleneck. Here in the US you can sell used lifepo4 so when I become more proffisional in managing my system, I will sell my battries and buy 280ah but at that point every thing will be easier, just replace the battries without need to replace any other thing