If the taxpayer wasn't funding your solar panels, it would be financially unviable.
Sadly, solar power at this level will always be pointless- far better to spend our taxpayers' money on something meaningful (e.g. a good power station) than waste time and money on subsidising PV panels on individual houses.
I wish you well with your payback in 12 years!
I hope governments (US and UK) stop subsidising these panels and let them succeed or fail on their merits, instead of an opaque quasi-benefits system.
Is solar power a viable power option: 1000km x 1000km of Sahara solar power is enough to power the world