If you mean 24 hours a day forever at 2kw then the solution really needs to include a 2kw petrol generator for when it rains for two weeks and there is no sun.

If you mean 24 hours a day forever at 2kw then the solution really needs to include a 2kw petrol generator for when it rains for two weeks and there is no sun. Otherwise supplying the last outlying 20% is going to get insanely expensive.