ktmrfs wrote:
another note: You want (well I say need) the controller to be near the battery, not on the panel. Especially if the cable is very long. A couple tenths of a volt drop in the cable really reduces charge rate.
But most every portable panel mounts a controller on the panel. Consider either removing the controller on the panel and mounting it near the battery, or bypassing it completely and using an onboard controller.
I did that and am glad I did. I also strung a steel cable along the power lines so I can lock my portable panel to the rig.