Invisible solar is a genuine use case in areas with shitty power tripping HOAs, but even regular solar takes a decade to break even, so if you sell something like that at inflated Tesla level prices then they simply never will and there is no reason to buy them in the first place.
My solar install took about 4.5 years to break even, which I understand is maybe a bit below average for where I live (Ireland).
Although isn't there an Irish government grant to help cover the cost of the panel + installation? That would make comparing break even times across countries quite difficult.
Certainly isn’t today. In the U.K. solar panels have about a 14 month payback, no incentives other Thant hey are currently tax free (like food. Electric from the grid has a 5% tax)
On top of that there’s an inverter, and if you can’t use all the power immediately you’d need a battery too, which tends to increase the cost.
The biggest cost though is installation.
I imagine the costs of purchasing and installing the panels in the UK are similar, but in Ireland there's definitely grants:
https://www.citizensinformation.ie/en/housing/housing-grants...
You do make a good point about VAT on electricity bills also being a factor in the break even calculation. In Ireland it's 9% and that's a temporary cost of living measure and will revert to 13.5% in 2030.
That's where regulation comes in. California for example made it almost impossible for a HOA to block. You're not allowed to add more than $1K to the project with your 'requirements'
Of course, the solution to that is to nullify all HOAs, power tripping or not. They were a mechanism to enact segregation, and as such should've had no place when created, and certainly has no place now.
What is a HOAs?
Homeowners' associations
https://en.wikipedia.org/wiki/Homeowner_association