Cord
Veteran Member
I'm looking to purchase a solar panel to keep by batteries at full charge for a piece of equipment which is stored in a remote location. This piece of machinery has a diesel 12v engine and two batteries. Typically, I'd use a 3amp battery maintainer. The solar panels are not rated in amps, but watts. How many watts do I need to maintain these batteries? In the winter, this panel will be covered with snow, so please take that into consideration. I'm currently thinking about a 15watt panel, but it says that a controller is required. When do I need a controller and why?