garygid
Well-known member
Looks like a great way to energize your new year!
You should put a link to that in your sig and OP for easy reference.mwalsh said:You can see graphing on my Sunnyportal site:
http://www.sunnyportal.com/Templates/PublicPageOverview.aspx?page=eb178848-3d09-431d-a9aa-d94379403702&plant=0f19afd5-0303-427c-9ef4-934a64228dde&splang=en-US
drees said:You should put a link to that in your sig and OP for easy reference.
Jimmydreams said:Yesterday was a great day for December solar.... 25.69kWh generation yesterday is a great pull for these short days!! (6.7kW system)
mwalsh said:Jimmydreams said:Yesterday was a great day for December solar.... 25.69kWh generation yesterday is a great pull for these short days!! (6.7kW system)
And today too! I'm already at 13kWh. Of course, that won't hold up....I get some pretty nasty afternoon shadowing from the neighbors chimney in winter.
mwalsh said:The chimney I can't do much about, but the palm trees they planted in about 10 years time......
Actually, if I'm completely honest, I'm not massively enthusiastic about laying the CA Solar Act on them. I mean, it's not their fault they neglected to consider that I might be installing solar in 10 years when they first planted them. We may just see how much impact they have - the are south east of my roof line, so really only the potential to be a problem on winter mornings.
Boomer23 said:Sounds like minimal impact, mwalsh.
That said, it turns out that shading has a much bigger impact on PV array output than the percentage of the surface area shaded. A single panel shaded 10% might have an output 50% or 60% less than the same panel without shading (I'm guessing at the percentages, but I've played around with panels and I've seen the impact of shading). I think I also read that multiple panels on a single inverter can have their output compromised if a single panel is shaded. Others with more knowledge might correct me on that last part.
Still, if it's only on winter mornings, minimal impact.
Jimmydreams said:You're right about one panel being shaded bringing the whole string down. That's why people are starting to switch to micro-inverters on the back of each panel. That way, if 1 panel is shaded, only THAT panel sees a degraded output....all the others chug along at whatever rate they can. Also, the power coming all the way down from the roof is now A/C power vs D/C (since it was converted at each panel via the micro-inverter).....I believe A/C power has less transmission loss over a given distance, but I'm not positive. So depending on your circumstances, micro-inverters can make solar work better in places with some shading. But they're a bit more expensive. AND, there are more points-of-failure that your system might have but can endure. If my 1 inverter goes out, my whole solar is useless....if I had 30 micro-inverters, I could lose one and not worry much while a new one was being shipped.
Truth here. AC became popular for transmission because a simple set of coils (aka a transformer) can change voltage with relatively high efficiency. By jacking up voltages to tens or hundreds of thousands of volts, you can reduce your I-squared-R losses and come out ahead.mogur said:Actually, DC current transmission is more efficient than AC, everything else being equal. Edison was right about that and Westinghouse was wrong. The big problem with DC has always been that it is more difficult to convert it to different voltages and from DC to AC and vica-versa.
Generally about 0.4% more for each degree C drop in panel temperature. The spec sheet for your panels will have the exact number, but 0.4% is pretty standard for standard silicon modules.Azrich said:Do panels generally produce more in lower temperatures?
Azrich said:Do panels generally produce more in lower temperatures?
That is what we both said.wsbca said:Azrich said:Do panels generally produce more in lower temperatures?
No, they produce less power in higher temperatures
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