Take a look at the Tesla website. You enter your address (so they can see the size and orientation of your roof) and your monthly usage and they'll tell you what percentage of your roof should be solar.
Not as useful for you, Debelg, as you don't need a whole new roof (which is what the Tesla tiles give you, albeit at quite a cost) but interesting all the same.
Don't forget that the cost of a storage battery is coming down every year (as are the solar panels) so if you want to come "off grid"...
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