I don't have to explain how extremely beneficial it is to have a battery back up now a days. Especially with this one. These Goal Zeros generators can be charged with solar. Great for camper vans and also great for camping in general. Price is with generator and yeti tank and yeti link to connect multiple yeti tanks. Goalzero sells a transfer switch to permanently wire into your existing electrical panel to have solar energy without having to spend $40,000 to install panels. Brand new never been used and only opened to take pics. It's been charging to keep the batteries healthy as it says to do in the manual. Buy this unit and you'll save a couple hundred bucks in shipping if you buy from me.