People with solar panels on their roof, how is it working out just now?

Um, yeah - would say so. Combined with batteries we're unlikely to pay any more than standing charge for electricity from now until October. That'll include using air conditioning in the summer and no fuel bills for cars. The most we paid this year for electric in any single month was about fifty quid, which included some car charging. We overpaid for the panels - put more on the roof than we can use with the inverter on the basis that bigger inverters will be a thing at some point and that there's no guarantee we'd be able to get the same panels in a few years time (to avoid mismatching). We also haven't started selling back to the grid because of the inverter thing and don't want to have to go through the G99 process twice when a bigger inverter comes along (and yes, we could run two but can't be arsed about that right now). Absolutely no idea about the payback period - fully appreciate we're spectacularly lucky for a number of reasons to not have to even think about that. We're using the solar/batteries as a hedge against costs when we stop working; turns out retirement planning isn't only about pensions. If calculations/projections are the sort of thing is interesting to you bear in mind that once you're producing your own electric, there's lots of new things you can do - we would never have thought about aircon otherwise and certainly wouldn't have factored that in when we were deciding what set-up to go with. And you don't have to worry about energy efficiency either - so we can use devices designed for pro kitchens without even thinking about the power consumption.