I’m assuming that you’re referring to project brief 4.2? If so, we’ve answered some questions regarding that challenge, that you may find useful. Perhaps check these out (Link Below), and if you’ve still got specific question, come back to us.
Further, it is also appropriate for you to make some assumptions of what features you believe should be included, based on the resources and information provided in not only the Energy Design Area, but also in the other design areas and the Resources section.
Mobile Power Supply Challenge (Design area 4.2)
Mobile Solar Power Supply