The fact of the matter is there is no one size fits all system. Too many contractors are asking their customers to sign a contract before anyone knows the actual results the system is going to provide. The first person that visits your home should not be a sales person. It should be a professional tradesperson that completes a full examination of your home to bring back to an engineering team. Only then can an accurate design be completed and a true offer actually made. 

Find a company that can actually DELIVER on every promise they are making. There should never be a promise made that can’t be put into the contract. It’s a huge red flag anytime a promise is made that is not in bold black and white writing. People need to make sure the power production guarantee is legitimate, and not just a “degradation warranty” being disguised as a production guarantee.