06 Sep '11, 3pm

Amazing Green Building, Questionable BIPV Solar Install

Note the comment above that vertical and even west-facing PV panels are not as inefficient as one might at first think. I saw a west sloped PV system on a house and thought it was very suboptimal and a waste of money until I worked out the numbers. Even in a suboptimal configuration, over the course of a year, the array still generated almost as many hours per day as south facing panels. In California net metering is based on time-of-day billing, and the price in the afternoon is more than the morning. The west facing panels generated more energy in the afternoon when prices were higher. With time of day billing, it turns out that the optimal revenue for fixed tilt panels won’t be south facing! (Note that when the sun is high, the direction of the tilt doesn’t make a huge difference.) With BIPV one can subtract the costs of material and installation of siding/roofing repla...

Full article: http://www.greentechmedia.com/articles/read/Amazing-Green...

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