From a cost and efficiency standpoint, you're better off just getting these lights. Not only is it cheaper than buying a panel and an inverter. But trying to convert to AC is going to have some decent inverter loss. These lights are all DC, so no inverter loss and it's all self contained, just string them up and you're good to go.

The alternative is to get a small solar generator kit like this. It's not waterproof or anything so it would have to be something you bring out and plug in when you want the lights.

The even more expensive alternative is to get a 200-300 watt panel, an MPPT controller with an inverter, and a battery. But you're now looking at a several hundred dollar setup.