Originally Posted by redthunder
I am looking to get a solar battery charger to keep power up while boat sits on the trailer. Any recommendations on which one to buy? And are they any good?
I think there's answer if you're a little clearer on what you want to achieve.
Will an auto bilge pump run? Is there any other electrical drain? If the answer to either of these is yes, then solar charging will be of very limited benefit unless you're happy spending a lot.
On a good day, budget chargers can just about overcome the natural drain of a lead acid battery assuming there's no other source of drain like the pump. What they won't do, unless you're into serious spend and large surface areas, is provide a strong positive charge to a depleted battery.