With soaring electricity prices everywhere it's now as economically viable as never before. However, you should massively overplan on solar and storage, maybe add some wind generators to the mix if you plan on never going back to grid in an emergency. Maybe even a small gas powered generator for emergencies could be a good solution. Being off-grid means, you can't rely on others to help you out, when wind and solar don't deliver. Especially in the winter, where solar delivers like 20-30% of what it delivers in summer(numbers derived from my own experimental setup).