I would disagree with pretty much everything fishinghat said.
Solar is a great addition to any boondocker's charging line-up. With enough solar, you will not need a generator in many cases.
Panels are rated in watts, not amps, and basically come in two voltages... 12v nominal and 24v nominal.
The charge controller you refer to is known as an mppt controller... maximum power point tracking. The other option is a pwm controller... pulse wave modulation. Actually, both are pwm, but the latter lacks the ability to track the maximum power point.