Solar powered onboard charger options

I am looking to install something along the lines of the ProMariner Pro Sport 20 onboard charger to keep my accessory bank of batteries charged(three XS Power d2700's). Only problem is, I do not have access to AC power down at my dock.

Does anyone know of any solar options that would allow me to plug in the Pro Sport 20 or anything else that would be similar? I could mount it to my lift then and not have to hassle with removing the boat from the water to charge them up.