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Rick H Parker

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Reply with quote  #11 
1) Panels without Power Optimizers (DC-DC converters @ each panel), mounted flat on my roof (240 degrees azimuth) vs panels mounted 180 degrees azimuth, the payback went from Year 12 down to Year 10.

That is expected, 180º azimuth is due south.



What is the cost to remove, store, and reinstall the PV system when it comes to 'reroof' asphalt shingles?

That is a question for a local roofing contractor. It would be due diligence to have the roof inspected and get a consultation before installing the solar panels.  You might consider converting the front part of the roof from asphalt shingles to a metal roof. A good metal roof would outlast the solar panels.  Some of the Firestone roofing systems have warranties of 25 - 30 years which is on par with solar panel warranties.

  • Asphalt shingles – Normally, asphalt shingles last about 20 years. However, high-quality asphalt shingles can last (and have a warranty) up to 50 years. These high-quality shingles do come at a higher cost, but will more than double the life of your roof.
  • Architectural asphalt – This version of asphalt shingles tends to last approximately 25-30 years.
  • Wood shingles and shakes – The normal life span of wood shingles and shakes is 20 years. However, under normal and moderate weather conditions, they will last much longer.
  • Metal – According to the International Association of Certified Home Inspectors, metal roofing is expected to last between 40 and 80 years. As well, the Metal Roofing Alliance gives a life expectancy of 40 to 60 years.
  • Slate, concrete and clay tiles – These durable roofing products are rated with a life expectancy of 100 years by the NAHB and NACHI.


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Rick H Parker
Kansas, USA
Electronics Engineering Technologist

kilimar

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Reply with quote  #12 
Quote:
Originally Posted by Rick H Parker
1) Panels without Power Optimizers (DC-DC converters @ each panel), mounted flat on my roof (240 degrees azimuth) vs panels mounted 180 degrees azimuth, the payback went from Year 12 down to Year 10.

That is expected, 180º azimuth is due south.


This is what Superior Solar said, "Both your front and side roofs have south in the orientation and are both considered good for solar photovoltaics. I cannot tilt, elevate, or angle that panels to face 180 degrees due to the wind loading requirements with the Florida Building Code. It has to anchor into the trusses mounted flush to withstand hurricane force winds. The system mounted flush at the same angle of the roofs will perform well. Ideally 180 degrees South is optimal, but an azimuth between 120 and 240 is great at our latitude of 29 degrees in Central Florida." 

It can be done, they just choose not to deal with the hassle.  Or perhaps in their experience, in this region, they know that the extra cost in non-flat mount is more than the power it produces over the life of the system.




Quote:
Originally Posted by Rick H Parker

What is the cost to remove, store, and reinstall the PV system when it comes to 'reroof' asphalt shingles?


I am not asking about the roof, but rather the PV system.  And I got my answer.  

Superior Solar said, "We currently charge $100 per panel to remove and reinstall solar electric systems. We would store the panels either in the garage, back yard, patio, etc while the roof is being re-roofed and then reinstall once the roof has passed inspection."

I also asked about the using the SolarEdge w/o power optimizers and Superior Solar said, "The power optimizers are required for the SolarEdge inverter system to perform properly. The SolarEdge inverter will not work without the DC optimizers. " I asked them if I am there is a different option than SolarEdge inverter. 

Someone on Reddit suggested instead of using a single SolarEdge 10000 inverter to use two SolarEdge 6000 inverter, because the SE 10000 has a fan ("user replaceable" -- sound like, this will fail for sure, so we made it user replaceable) vs the SE 6000 which is passively cooled.  I ran the numbers through SAM, the payback was slightly better, but I am wondering if the payback is better only because the CEC weighted averaged efficiency of the SolarEdge 6000 (99.2%) is higher than then SolarEdge 10000 (97-97.5%).  The payback period was still 10 years but the dollar amount was different in that 10th year.  Less than a $1000 and more than $100 on the 10 year.   Unfortunately, Superior Solar currently does not offer the SolarEdge HD 6000, but they will in the future.


kilimar

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Reply with quote  #13 
What is the cost to remove, store, and reinstall the PV system when it comes to 'reroof' asphalt shingles?

SolarCity said $500.  Fixed cost.  Interesting.  I wonder if I can get that in writing so that it's good for 15-20 years. [smile]
Rick H Parker

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Reply with quote  #14 
I am not asking about the roof, but rather the PV system.

My point is, cost-wise the two are intertwined. It would not make sense to install panels on a roof that is due replacement in 5 - 2 years, past due or in need of repair. Also if the replacement schedule of the two are in sync, the cost of panel removal and reinstall can be avoided.

I wonder if I can get that in writing so that it's good for 15-20 years.

I'm sure they would be happy to write you a 15-20 year full coverage service contract for a fixed price. But a 15-20 price guarantee for free .... your allowed to dream. [smile]

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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
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