Thank you everyone for your valuable advice. I am definitely wanting to purchase equipment ones with an eye toward future capacity increases. I only have room on my roof for one and possibly two of these panels. My plan was to try that first with the existing controller in my backyard and monitor the results.
I understand the differences between PWM and MPPT controllers as well as the price difference, but I am willing to pay more for a more efficient controller which will better utilize the available power of whatever panel is installed, especially considering my limited roof space.
I want a controller that will handle the full power output because on some trips I may choose to bring one or two additional panels which I could locate on the ground near the trailer if desired as well has the two on the roof.
Up until this point in my life my only experience with solar and I camping situation was my 45 W harbor freight "hobby grade" I have gotten through several long weekends dry camping with that kit and my 2 12V batteries, that was with rather frugal energy rationing and I would like to be able to be less worried about power.
By the way for those of you who were asking, my boss and I got all of this used equipment for free, so anything I can salvage is a blessing. Now, about the wire, The way they had it wired from the factory had two of the panels in parallel running down to the controller on one wire pair and then the other three panels in parallel on a separate wire pair. The equipment with the six 75 Watt panels had three in parallel on one wire pair and the other three on a separate wire pair to the controller.
Thanks again.
