When it comes to solar you need to go big or go home. Id suggest you aim for a mppt charger controller to keep things charged and topped off and if you are lucky, maybe you will have some extra. Id suggest putting the extra in a battery so if you get beside a big truck or its a cloudy day you can still use your goodies.
If you need to loose the energy, get a dump controller. They use those in wind turbines to regulate speed in high winds.
