in addition to that .... I never seem to see (but would like to see) is what the 'cost saving' calculations would look like if one factored in paying for the capital cost ) of PV, batteries, fancy control systems etc.) over a period of a few years.
I realise that their are considerations of things other than (monetary) cost saving, but they are presumably not in the forefront of the minds of those who primarily write about, and calculate/estimate, thopse 'cost savings'.
Kind Regards, John
I did a calculation for £6k worth of batteries over 10 years, and it was was a money-loser.
I also did it for a £250 solar immersion controller. Money-loser.
People unlucky enough to have no gas supply may do better, because heating by electricity is so expensive.