The Vevor solar suitcase looks like it would nice and light. The thing about solar suitcases is that if it doesn’t come with a controller attached to it what do you need to buy and where does it attach. The heavy Zamp that I have is a plug and play. The controller is connected to it. I would like to purchase a lighter one like the Vevor. The Vevor is a good price at Home Depot. Just confused on the controller.