Solar Evaluation

One of the projects I had planned for the summer was to investigate installing solar panels on my new garage.  I had this vision that I could come home, plug-in my car in (plug-in car required), and have it powered cleanly from the sun (sun required).

The proposed location:

I thought I had the perfect spot…at least it appeared that way all winter.  What I forgot about, and what became obvious over the summer, is that my neighbor has a perfectly lovely tree in their yard that is shading my solar spot….and the tree is still growing!

The company giving me the quote ran what they call a Solar Access (the ability of one property to continue to receive sunlight across property lines without obstruction from another’s property) estimate for my location (tree shade growth not factored).  For you geeks out there here are the results:

Without the tree the numbers aren’t bad, an average of 86% over the year.  Who says Portland doesn’t get sun????  The estimated energy savings if I could achieve this level of solar access would be 2,482KW per year.  This would offset ~20% of my current usage.

The Cost:  This is where the rubber met the road….a 3kW system would cost me $17k.  The incentives are signifcant, over a 4 year period the total cost to install would end up closer to 5k.

The Final Analysis: Although this was never about the ROI, I had to crunch the numbers anyway.  Using the offset estimate, an esitmate of future electric rates, and the cost of the system after incentives…it would take 10years to pay for itself….which I found to be a bit depressing.

The Reality:  I don’t have 17k to spend right now (you will see why later) on what would essentially be a “statement” that I care about my footprint.  I have not ruled out solar (smaller system…bigger than a light and smaller than 3kW) for perhaps another spot in the yard but for now this project is “Closed”.

I’m still following the Solarize NE activities and am thrilled I live in a city with opportunities and groups like this one.

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