Quote:
Originally Posted by Vern2
Stevehull,
What are you guy's talking about on emphase efficiency percentages? If I understand what your talking about SMA is in the high 90s.
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It is the “DC to AC Derate Factor” for PVwatt.
Below is how the come up with the number.
NREL: PVWatts - How to Change Parameters
I think the wire size is unique to each install requirements. My array was about 120 feet from my house.
We had existing #2 aluminum running out to the barn and I wanted to keep it. From the sub panel out to the array I ran number 8 copper. Then that goes to number 2 aluminum to the disconnect switch then number 6 copper to the main load center. I had to upgrade my load center to a 225 amp service but I still use a 200 amp main breaker in it.
I also center feed the M215 microinverter. The most M125' s before a Jbox is 5. When you are some distance for your house you really need to watch out for the voltage rise. (you need to keep voltage drop less than 2%)
If you are longer distance from your array you will need to get very familiar with this document
you don’t what to put it all in to find out it will not keep running as soon as you get some good sun.