Does my solar work if there is a power cut?

div#stuning-header .dfd-stuning-header-bg-container {background-image: url(https://gienergy.com.au/wp-content/uploads/2017/05/Home_HeroBG.png);background-size: cover;background-position: center top;background-attachment: initial;background-repeat: no-repeat;}#stuning-header div.page-title-inner {min-height: 100px;}