There are so many variables in installing solar on a particular home, as well as so many other people that play into the mix. Because we can only control what we play an active part in ie:sales process, it is important to set proper expectations on frequent issues that may arise, then assure your customer that you will actively monitor thier project, and be thier advocate. In addition, ask for that referral after inking the deal. Remember, they went with you because they were eager and excited