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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).
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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.
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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.

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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.

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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.
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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'
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What is a HOAs?
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