https://www.ebay.com/itm/127188373174?toolid=10001&customid=fe4f221e8d9c11f0af198aed7c8d36d00INT 2-Pack ECO-WORTHY 14kWh 51.2V 280AH LiFePO4 Solar Battery Backup w/ 200A BMS + Busbar (Version2) on sale for $4199.99 - $350 with coupon code FRESHPICKS at checkout = $3849.99. Shipping is free.