"This device is essentially a 110v 15amp outlet. Tesla says you can get 2-3 miles of added range for each hour of charging from this type of power source. At first glance I thought it was overpriced, but it’s not out of line with other offerings for portable solar panels. With a little premium for the packaging it seems reasonable. Pricey, but not overpriced. As an apartment dweller with no choice other than public charging it will take about 100 months to break even with Tesla SuperChargers. But, once you buy one of these you eliminate the risk of electric rate increases. It’s on my wish list. "