Wind blows 24 hours, 3 times more water and more cheaply too:
https://youtu.be/9xYXWISWv5I?t=6m28s
There are abundant small-scale wind turbines available, but there are rarely opportunities for them to perform nearly as well per installation effort & cost, as large 1MW+ turbines mounted on massive towers. A town of 100 households who each set up wind turbines in their backyards are paying >10x what a town of 100 households who buy a share in a wind farm coop for the same amount of electricity are paying. Wind has gotten very cheap very quickly over the years since Altamont Pass was put in with 100kW turbines, and a lot of it is down to bigger turbines and towers.
http://www.sunnypanels.com/wp-content/uploads/2014/11/wind-e...
http://www.power-technology.com/projects/solaronesolar/image...
Solar photovoltaic power, on the other hand, scales down fairly well. It doesn't deal with altitude-dependent winds. The economies of scale, while still considerable, are smaller because no matter the scale, all solar photovoltaic facilities involve parts that fit on a shipping pallet.
24 hour operation may not be requirement. Clean water stores just fine.
I was going to list a counter example of a place where wind would be a better idea, but all the cloudy places I can think of have rain, so they probably get water from that. It's a big world though, I'm sure lots of places have bad enough sun that the number of panels would make the cost tip in favor of wind.
I had 10 liter can and I needed 3 liters/day, so I started the windmill only twice per week.
There are many small scale wind generators that produce more than enough energy to run watermakers on yachts, much more cheaply solar panels for the energy output.
This has been a solved problem for quite a few years.
Wind blows 24 hours ...
... 3 times more water ...