I used EnergySage for solar panels I purchased. By putting in basic information for the system, I received multiple eight bids to compare for pricing, equipment manufacturer, warranty, and company info. From Energy Sage, this information came through email so not bombarded with calls! An EnergySage advisor helped review the quotes and covered an overview if important parts to narrow down to three companies to contact for firm quotes and interviews. The winner was there recommendation with best pricing, local company that does installs for other companies that used best rated equipment. Thanks EnergySage! Erik Haffner, homeowner & engineer.