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RE: OK.point taken. How much does

Obviously, you get more production in Summer than Winter because the days are longer. Bad weather does kill production, but overall, everything tends to average out, so it's not something to worry about.

First, you need to pull your old bills and find out what your average usage is per month and annually. Then, you can figure out how big a system that you need. A caveat is that your location is a variable along with the orientation of the panels. South facing is by far the best. We have both south and west facing panels. The southern panels product nearly 35% more power because they get sun all day long. Your installer has a program to calculate these variables. Or, the free solar guys should have the specs on what they guarantee the system will produce (in kW), and the number of panels and locations of the panels.

You can see the difference in the image below of the layout and production since January. The panel on the lower right side of the top grouping have partial shading in the morning which also shows in the production numbers.

The next two images are of daily production in February 2016 versus 2017. We had a lot of rain and totally cloudy days this year. But over the course of the year, those issues tend to even out.

Finally, the last image is annual production. We started with an 8.4 kW system with 40 panels. In September of 2014, we added another 18 higher rated panels or another 4.5 Kw which shows with the bigger production and since they were all south facing, they're more efficient than initial installation which was half west and half south.

Overall, on an annual basis, the production is fairly consistent. We were getting about 13,000 kWh per year from an 8.4 kW system and it went up to about 19,800 Kwh for our current 12.9 kW system.

So, the key question is what is your average monthly usage or total annual usage over a few years? Then, what would be the orientation of the panels? Other variables are potential shading issues along with where you live. Seattle gets more cloudy days than San Diego.


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  • RE: OK.point taken. How much does - Rod M 13:07:26 03/18/17 (0)


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