Over the next Milestone, your installation team will work on creating a complete design for the upgrade of your home. This will detail all the relevant components of the job – where individual parts and pieces will go, how the wires will be connected, where additional systems (like in-home batteries) will be placed, and so on. This may take longer for particularly large or complex solar arrays, but most homeowners can expect to get the plan within 3 weeks or sooner.