Originally Posted by Khale
Make sure you match up the specs on your new panel so that you don’t lose any efficiency. Mounted or portable is a tough decision. Since you have one on the roof now go with a portable so you can chase the sun when the other one is not in a good position. My 2 cents.
My understanding is that the zamp connector on the trailer goes right to the batteries, putting the charge controller for the portable panel output in parallel with the existing charge controller. Doesn’t sound too efficient to me. Wouldn’t the controller that can provide the higher voltage dominate, with no contribution from the ‘other” controller?
It seems you want to have all your panels wired to the same controller.
Maybe someone with direct experience in how these controllers work can shed some light on this.