In August 2010, Peter came by our house to see the roof and review our options. Considering the location of the dormer on the south side of the house, and the existence of the big white pine at the front, it looked like approximately 8 panels would fit on the west side of the dormer.
The two types of panels proposed for our project are as follows:
Option 1 – Eight Sunpower 215W panels. These are premium panels that Ottawa Solar was offering to lower the price on as they had left-over from another project the number of panels needed for ours. Fully installed, including taxes and Hydro connection cost is just under $20,000 with an expected revenue in Year 1 of $1684 (8.64 % of initial cost).
Option 2 - Nine Conergy 220 W panels that would fit in our roof space which are quite similar in ROI (after we discount the Sunpower to a bit below cost). The cost would be just over $21,000 with an expected revenue in Year 1 of $1890 (8.64 % of initial cost).
It was indicated to us that Sunpower panels would produce more revenue per kW installed mostly because of the lower degradation rate, and the avoidance of the Light Induced Degradation so their panels don't lose 2-3% on the first day in the sun. Both panels run on SMA 3000W inverters.
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