What happens when you want to remove your roof solar panels?

madsci1016 · October 2019

Thinking about adding solar DIY style, as I'm very good with electricity and power tools. I am not confident in what happens when/if it comes time to sell my house and I want to remove the solar system. If I've screwed it into my roof, how do I remove the panels and rails and not ruin the roof? Screw the screws back in to fill the holes? Will a home inspector balk at that? Anyone have knowledge / experience of removing solar to sell the home?

My DIY system would be off grid and I would not have pulled permits, hence the need to remove it during a house sale.

It's an asphalt shingle roof.

Photowhit · October 2019

Suggest if you don't want to make it part of the home, to do a stand alone system NOT mounted to the home.

The simple ground mounts of my cabin system were easily moved, after I sold it, in sets of 4 panels removing just a few bolts.

The battery box and power center sat on the larger outer frame to make everything stable. Having trees behind the system made for no problems in up to 60 mph straight line winds.

wellbuilt · October 2019

Hi Madsci , it depends on how you mount the system to the roof .

I used the iron ridge 1000 system I have 5/6 holes for each rail and the mounts are staggered so the weight is distributed on most of the rafters .

The holes are under the shingle area , but the shingle above the mount is cut around the foot you would just replace the shingle.

If the shingles are old the color mite not match and they get a little harder to remove .

It is a easy task to just unscrew the mount and replace the whole shingle . John

mcgivor · October 2019

A non conforming array mounted on a roof may be in violation not only of electrical codes, but may void any home insurance, if applicable.

Estragon · October 2019

+1 on ground mounting. As John said, it's not that big a deal to replace some shingles, but IMHO when an inspector sees signs of the (unpermitted) rooftop solar it will raise a red flag and may prompt a harder look for other issues.

In my city place, there would be a pretty good chance I'd be forced to remove work done without a permit, and rooftop solar stands out. At my cabin, they'd just give me a strange look if I tried to pull a permit.

madsci1016 · October 2019

I'm in the good old boy south on unincorporated land, so i think the risk of being "caught" while i own the home is low. I'm most nervous about if/when I have to sell the house how well I'll be able to restore the roof. I did save several cases of extra shingles from the new roof I got 6 months ago, so just replacing the shingles sounds like a good option.

I'd much rather ground mount, but the front of my home faces the south and the wife didn't like that idea. No room in the back.

I've also talked to adjusters (not mine) and searched on the web. The whole "voiding home insurance" seems to be a myth, as I got back alot of responses to the effect of 'as long as it wasn't malicious/intentional to burn the house down, they don't care'.

Estragon · October 2019

I explicitly told my insurance company broker about the solar system in the valuation/underwrting process. There are some conditions which would make them refuse coverage (eg I had to send them photo proof I had uninstalled an older non-WETT certified wood stove), but they were ok with the solar.

That said, I haven't had to make a claim

madsci1016 · October 2019

Geez when I bought this house 5 years ago the insurance never even bothered to look at it. Went to a broker and he just had several companies bid on the value appraised by the county/bank and that was it. I'm the one that had to pay for a private inspection just to make sure I wasn't buying a money sink.

706jim · October 2019

The holes in the roof are just one problem. I found that rainwater cascaded off the panels overloading the bottom two feet of shingles causing premature leakage when I had mine on the roof. If you have room ( I do) panels on the ground can be inspected, cleaned of dirt or snow and more easily monitored for output.

wellbuilt · October 2019

It’s allways handy to have left over shingles to patch with , that helps but shingles fade overtime .
No one will have a problem with a proper shingle patch .
as far as shingle Leaking from the bottom the solarguys around here have a Transition piece
of aluminum that is angeled so the water runs off the panels and on to the roofing with out splattering .
My roof is steep and don’t seam to have that problem

madsci1016 · October 2019

My roof is also steep and I paid extra for "50 year" 300 lb shingles, and peel and stick self sealing underlayment. I'd hope rain water wouldn't be able to chew through that. Thanks for pointing that out though.

I really do wish ground was an option. There's a small area where I could do a carport like structure but the panels would be horizontal and take an efficiency hit. I read that it'll maybe be 15% less than tilted at my prime angle, so I am considering it. Just means much more building/diging.

Estragon · October 2019

My understanding (which could be wrong) is the rainwater flow accelerates the loss of granular material from the shingle surface. When enough is gone, the lower layers are exposed and degrade mainly from UV exposure.

I have my pv on a carport-like structure:

madsci1016 · October 2019

Ooo nice that it's perpendicular to your south face. The only place I have room for this runs North-South, so I wouldn't be able to tilt like that unfortunately. But I'm at 30 deg Lat it's not killer to be horizontal ( i think) .

Estragon · November 2019

The flat roofed atructure was built specifically to accomodate the solar, but is also useful as a sunroom/woodshed/deck cover.

My panels are set quite steep mostly in an effort to shed snow. Not likely a problem for you at 30° latitude. A bit of tilt is desirable to get rain to wash debris, bird bombs, etc off though. Going flatter than latitude will likely reduce winter mid-day production by a bit, but can produce earlier and later in the day much of the year to offset to some extent.

With a flat roof and slightly tilted (eg 10-15°) panels in east-west rows, you wouldn't need much space between rows to avoid shading. There are also ballasted rack systems sometimes used on commercial/industrial flat roofs which may be worth considering if local conditions (eg no hurricanes) allow.

madsci1016 · November 2019

Lol yeah we just got a direct hit from a Cat 5 hurricane last year, so yeah gotta think hurricanes. Though we don't get them often, that was a fluke.

New thought is a hybrid roof/ground install. Basically tie into the fascia board along one side of the house and create a "covered walkway" of sorts down that side of the house. I can hit about 5KW of panels that way. But they would be facing due east-south-east instead of south. Any good resource to calculate the efficiency hit I 'll take because of that?

icarus · November 2019

PV watts calculator lets you plug in off angle/‘off azimuth PV.

https://pvwatts.nrel.gov/

Solar sheds/carports etc are pretty common: http://www.jc-solarhomes.com/css/installingSolarPanels.html

tony

madsci1016 · November 2019

Thats useful thanks. Shows about 10% loss for not facing south nor the ideal angel which matches about what I found when I googled the crap out of it. Man it's hard to google DIY info and not get inundated with sales pitches from solar companies.

Estragon · November 2019

It will also depend on any terrain/shading to the east which might limit morning harvest when the sun is low and shadows long.

WaterWheel · November 2019

As far as insurance claims go when I mentioned solar install to NEC 2014 standards the insurance company didn't care. They said the inverter ect inside the garage was covered under my personal possessions part and the ground mount panels were covered the under out side structures part of the policy. I did raise my outside structures policy coverage a bit.

What happens when you want to remove your roof solar panels?

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