https://www.ebay.com/itm/127156516698?toolid=10001&customid=9b2abeb4502f11f0a94f1a24a709bba30INT ECO-WORTHY 48V 280Ah LiFePO4 Home Backup Battery + 10kW 48V Hybrid Inverter on sale for $3,599.99 - $350.00 with coupon code THINGSYOULOVE at checkout = $3,249.99. Shipping is free.