This says his house uses 13kWh/day and you can see from the graph by dividing the monthly amount by 31 days that the solar panels on the roof generate around 29/day during summer and 2.25/day in winter. They would need five or six rooves of solar panels to generate enough to be off-grid. And that's not practical or low cost.
Terence Eden is in the UK: https://shkspr.mobi/blog/2013/02/solar-update/
This says his house uses 13kWh/day and you can see from the graph by dividing the monthly amount by 31 days that the solar panels on the roof generate around 29/day during summer and 2.25/day in winter. They would need five or six rooves of solar panels to generate enough to be off-grid. And that's not practical or low cost.