blrmaker
New Member
Hello once again.
We are currently in the process of building a new home. I intend on using 2@18kpv hybrid inverters according to detail 4.5 in the latest manual. I have questions on the solar array set up that I initially conceived and am looking for advice if this would be my best rout or if y’all have better ideas.
First off my main array will be approximately 250’ away facing due south on a 6:12 pitch roof which should be close to the optimal year round angle of 28 degrees at my location according to footprint hero. I plan on using 48 Silfab SIL-380 HC panels in a 12 panel string x2 paralleled into 1 per 18kpv in the first MPPT for a max of 506.04Voc and 22.72Isc. The problem with this location is that it will get shaded by the pine forest after 5 pm. I plan on using 8ga THWN wire to run underground through 1 ½” buried conduit from the array structure/junction box to the MPPT for each string and 10ga THWN wire for the ground (250’ total run).
Second array will be 24 of the same Silfab panels in a 12 panel string for each 18kpv on the #2 MPPT 506.04Voc and 11.36Isc. The problem with this location is pointing approximately at 244 degrees and is on a 12:12 pitch roof (45 degrees) however there will be no shading until sunset.
The 3rd array will be 20 Hyperion HY-DH108P8 400W(B) bifacial panels in 1 string of 10 to the 3rd MPPT on each inverter: 370.7Voc and 13.79Isc. This array will be on a south facing pergola over a patio by the pool with a 6:12 pitch (26 degree). This array will see no shading.
So one question is on the first array, is it worth running the 2@12 panel strings in parallel into one of the 2 available MPPT inputs on MPPT 1? This will save a running a second set of wires over the 250’. I believe the math works out according to the 18kpv spec sheet for being under voltage and amperage.
Next question is the 2nd array of 26 Silfab panels. This array would be on top of my garage which is a nice flat roof but with a bad roof pitch for optimal angle and pointing southwest at 244 degrees from north. This array will also be the closest to the inverters. Question is, is it worth installing on top of the garage being it is sub optimal?
3rd question on array 3 with the bifacial panels. Do you think there will be much bifacial gain being 8’ up and close to a pool and the surrounding light-colored concrete?
Finally, does my math seem ok for the ratings on the 18kpv?
For reference the land lay out.
Thank you all for your input!
We are currently in the process of building a new home. I intend on using 2@18kpv hybrid inverters according to detail 4.5 in the latest manual. I have questions on the solar array set up that I initially conceived and am looking for advice if this would be my best rout or if y’all have better ideas.
First off my main array will be approximately 250’ away facing due south on a 6:12 pitch roof which should be close to the optimal year round angle of 28 degrees at my location according to footprint hero. I plan on using 48 Silfab SIL-380 HC panels in a 12 panel string x2 paralleled into 1 per 18kpv in the first MPPT for a max of 506.04Voc and 22.72Isc. The problem with this location is that it will get shaded by the pine forest after 5 pm. I plan on using 8ga THWN wire to run underground through 1 ½” buried conduit from the array structure/junction box to the MPPT for each string and 10ga THWN wire for the ground (250’ total run).
Second array will be 24 of the same Silfab panels in a 12 panel string for each 18kpv on the #2 MPPT 506.04Voc and 11.36Isc. The problem with this location is pointing approximately at 244 degrees and is on a 12:12 pitch roof (45 degrees) however there will be no shading until sunset.
The 3rd array will be 20 Hyperion HY-DH108P8 400W(B) bifacial panels in 1 string of 10 to the 3rd MPPT on each inverter: 370.7Voc and 13.79Isc. This array will be on a south facing pergola over a patio by the pool with a 6:12 pitch (26 degree). This array will see no shading.
So one question is on the first array, is it worth running the 2@12 panel strings in parallel into one of the 2 available MPPT inputs on MPPT 1? This will save a running a second set of wires over the 250’. I believe the math works out according to the 18kpv spec sheet for being under voltage and amperage.
Next question is the 2nd array of 26 Silfab panels. This array would be on top of my garage which is a nice flat roof but with a bad roof pitch for optimal angle and pointing southwest at 244 degrees from north. This array will also be the closest to the inverters. Question is, is it worth installing on top of the garage being it is sub optimal?
3rd question on array 3 with the bifacial panels. Do you think there will be much bifacial gain being 8’ up and close to a pool and the surrounding light-colored concrete?
Finally, does my math seem ok for the ratings on the 18kpv?
For reference the land lay out.
Thank you all for your input!