Add to Cart Fortress Power Fortress Power Envy Inverter 8kW and Two eFlex 5.4 kWh Bundle ﷼36,334.04 Fortress Power Envy Inverter 8kW Whole Home Solar Storage AND Two Fortress Power eFlex 5.4 kWh Gen2 Lithium Iron Phosphate Solar Storage Battery LifePO4 5.4 kWh 48VDC (10.8 kWh Lithium Battery Bank) Fortress Power Envy Inverter 8kW The Fortress Power... Compare Add to Cart Add to Wishlist