If you’ve been on the sales/installation/design side of the solar industry for even a few weeks, you’ve encountered questions related to how system production is calculated. This is a reasonable question. It’s a question that strikes at the heart of the solar value statement. As such, transparency is the appropriate posture for exploring this question.
In solar, there are different grades of module (panel). A module’s efficiency and brand name are the primary factors that determine which “grade” it falls into. Over the years we’ve had many customers who come to us and demand we quote them with “THE MOST EFFICIENT MODULE.” That makes us chuckle to ourselves. Sometimes. Because solar economics just don’t support their demands.