I've sold a bunch of them

Dependency on one system will have a failure.
Solar doesn’t charge batteries at night or if extremely cloudy.
Propane trucks don’t deliver if the roads are iced over.
Gas lines don’t run if lines are down.

Most power outages in Texas would be during the summer.
Power outages on the coast would be more likely—hurricane season.

https://www.tesla.com/solarroof

The roof tiles look interesting. But, I don’t see a good ROI at my age.

Do both solar and wind. Plus I don't think most people would go 100% solar. Always good to have ERCOT as a backup.

As Hop said earlier, hail? What incentives are the government giving to do it?

I’d probably consider it if I lived on a bunch of land in the country. House down the street from me has them on their roof, but I’ve never met the people.

what they are good for
is when the grid shuts down

If the power goes out in a storm you usually don't the sun to power your house.

If you have the land don't put them on your roof.

Solar panels on new construction is required by law here. That should be all you need to know about solar. Don't do it!

Would be easy to put them on a frame instead of on the roof/house.

That's what the Tesla Power Wall batteries would be for. It could run essentials like well pump and HVAC for 2-3 days with the set up I had drawn up on their website. I also have a duel fuel generator and a 500 gal propane tank for emergencies. Unless a tornado of the F5 variety comes and completely wipes us off the face of the planet, I'm feeling pretty confident in survival of a storm. But...

Back to the OP question. How cost prohibitive is all of the solar? If the cost were not an issue, I would put up a ground based solar array and feed back into the grid that more than likely will be a Co-Op generated system. Will use this house as an example, based on Tesla solar estimate. I'm only referring back to Tesla as I have zero desire to climb back on roofs and do the work getting things wired and run around a sub panel and back feeds etc. etc. I just like their turn key operation, has nothing to do with the company itself.

2300 Sq Ft. house.
Avg. electric from the Co-Op is $80/month.
8.20 kW system with 2 Power Wall Batteries (damn they are expensive) = $33,400 cash price.
Federal Tax Credits $8684
For a grand total of $24,716.

So $25K / $80 month = 26 years to break even, give or take. And that's IF the equipment never breaks or has problems like the plastic being dirty/yellowing and reducing efficiency or as Hop mentioned, hail storms. Which brings up another question...

If you install a solar system, whether ground or roof mounted, how much of that is covered by insurance and if roof mounted, do you get a roof/hail discount for the solar panels taking the hail vs your roof?

Another good video and he also has a 1 year update in another vid.

We checked out a couple of places cost was $1000 per panel installed.

The roof is metal R panel that's dark red. I was looking at them as a efficiency improvement over having the sun beat down on the poorly-insulated roof.