I have a 100 gallon tank with an electric pump. It works great. However, I have to hook it up to the tractor or excavator with alligator clips to power the pump. I am thinking of getting a car battery and a solar 12v charger to run the pump. I only use the pump once every couple of days when I am busy so I don't imagine I'd need a high amp charging setup. Thoughts? Any recommendations on charger?