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02/02/2012

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Dodd Stacy

Marc,

Greetings. Enjoy your blog, especially the quantitative reportage - very informative. I mounted a pyronometer(?) - an SMA Sunny Sensorbox unit - on my PV system, which uses an SMA inverter. It's useful for logging the insolation at the site for system diagnostics, design verification, and for doing direct comparisons with the PV Watts et al database for one's location. Now, to negotiate with my southerly neighbor about topping a couple of evergreens.......

Best,
Dodd

Marc Rosenbaum

Hi Dodd, thanks for your comment. What does SMA claim for the accuracy of the unit? Have you compared measured insolation on your system with predicted? Are there local insolation stations (Dartmouth?) to compare with?
Thanks!

Dodd Stacy

I have to confess to not yet making much quantitative use of the data for comparison purposes. I'm not yet able to find a claimed accuracy for the unit, nor have I looked into local monitoring stations. I'm using it so far to look at shading and cloudiness effects over the annual cycle. It's interesting to see cloud edge amplification!

My first order job is to deal with winter shading and snow accumulation. Otherwise I'm pleased with system overall performance and reliability. You can look over the top level data at:

http://www.sunnyportal.com/FixedPages/PlantProfile.aspx.

Best,
Dodd

Marc Rosenbaum

When you say "cloud edge amplification", do you mean increase in output from skies that have clouds but the beam radiation from the sun is unshaded? If so, that's when I've anecdotally noticed the highest output from my systems over the years - winter, clear beam radiation, white clouds in the sky.

ryan

Low carbon is good for the community.

1. grow well: to grow vigorously and healthily
2. do well: to be successful and often profitable

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