Numbers posted here don't make much sense since 110A is huge amount of current. This is most likely typo and 110mA is the amount where Watt rating would make sense. That said, it's important to note that PV panels lose efficiency as the temperature grows, so I am expecting this to drop if left in car during summer.
It's an okay price for these and if they are indeed weather-proof they could be a great addition for small projects. Personally I wouldn't use it for battery maintenance as there's no mention of charge controller and even though maximum current is not all that big (assuming there was a typo) I wouldn't want something catching fire.