Yes, in locations like that you will have to use some other solution for those periods. Maybe wind power. Battery storage will not last long enough unless you have an absolutely massive setup that would not be cost effective the rest of the year.

I had 48KWh worth of storage, 2500 W worth of wind and another 5000 W worth of solar. This was in Northern Ontario. Until we added the windmill we fairly regularly needed the generator, after we added the windmill the generator just sat there gathering dust.

Could you say something about the analysis you did to decide that wind was going to be useful for you? I'm interested but I don't really don't have a good sense for how cost effective a wind turbine is or how to evaluate a site.

The Canadian meteorology department puts out pretty useful stats, and I dropped in on a couple of people in the neighborhood that had windmills up to see what kind of windspeeds they were seeing and how long on average their machines stood still.

This was a major factor in designing the machine the way I did, variable pitch is a lot more work but a machine like that will start up far earlier than a fixed pitch machine. It also had its effect on that stator, which I made with the laminates at a slant over 1/3rd magnet width, which reduced cogging to nearly nothing. This is a huge factor in starting up a direct drive machine.