Our Solar Ess 15.84 KWH ESS less expensive than Simpliphi 15.2KWh batteries. Our current ESS design is mainly for the European market, each inverter can stack 13 max. battery modules and max. 6 inverters can be paralleled. that is to say: 13*6=78 modules max. OSN Power designs and manufactures efficient, non-toxic, and enduring energy storage and management systems that utilize lithium ferrous phosphate (LFP). Based in Shenzhen, OSN combines non-hazardous LFP chemistry with its proprietary cell and battery architecture, power electronics, battery management system (BMS), and manufacturing methods to create safe, reliable, durable, and highly scalable on-demand power solutions. Available for residential, commercial, farming, OSN storage solutions have been rigorously tested and passed a series of certificates.