Add to Cart SALE Fortress Power Fortress Power FlexTower All-in-One Enclosure $2,150.00 $2,030.00 Fortress Power FlexTower All-in-One Inverter + Battery Enclosure. (Battery and Inverter not included). Add to cart to see our every day low Stellar Price! The FlexTower All-in-One is a whole home energy storage... Compare Add to Cart Add to Wishlist