I have the old C-Tek XS7000. Excellent charger manufactured by a company that knows what they're doing.
In the longer term you may consider a C-Tek D250S. You can feed it from both an alternator and a solar panel and it will auto-switch to the best source AND it will regulate the panel on its own AND charge like a proper smart charger (which it is).
Thanks Old Tony. I have a larger amperage charger but after a trickle charger such as the CTEK .08 just to maintain the batteries when the car is idle for a period of time.