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Solar panel advances will see millions abandon electrical grid, scientists predict
(www.independent.co.uk)
This is a most excellent place for technology news and articles.
You're (sometimes) charged a standing charge. Which you'll negate with sold electricity.
It really makes no sense to forgo a grid connection if you have one available. It solves a lot of problems, doesn't require you to oversize massively on battery storage, helps you when you need it and helps your neighbour when they do
There's no benefit to offgrid if there's a grid connection available