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Thumb of Michigan | Would you have them (or it) on all night? or just as needed?
If light is on all night, you would have to put more (bigger) solar panels up for the winter daylight hours to re-charge battery. So, the generator could be more cost effective, is my SWAG.
Using the SWAG method, a 100-watt solar panel with 5 hours of direct sunlight, could produce enough power to run one of your lights for 25 hours. This panel would have to be close to 90 degrees of sun during these 5 hours. If you got a bigger controller than needed, you could always add another panel or two. E.g. buy a 300–400-watt controller verses a 100-watt controller.
Here's a solar power watts generator that you can use for your location, so you can see what can be produced in the winter. And to give you an idea of the amount of power that can be produced in winter verses summer. It's about one-half the amount in my area. I would need in my area 3 or 4 100-watt panels for one light like you have posted as an FYI.
https://pvwatts.nrel.gov/pvwatts.php
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Solar Power set up for lights
