What would be a good amount of watts needed to maintain a battery fully charged without over charging. My vehicle might sit 1-2 weeks without moving. I was thinking somewhere between 2-5 watts solar battery charger as a maintance charge.

 

My dad has use a solar charger on his boat for years, he can say enough good about it.

 

That would be plenty, but I have a WallyWorld trickle charger that puts out 1.5 amps on my '72. It keeps the battery at 100%, and was only $17. Of course the sun is free power, but I dont worry too much about what mine uses for juice, as long as the ol girl will fire up after sitting for a month.