I have 100 watt system with a Morning Star controller on my TC. I was thinking of getting a portable 100 watt suitcase type with it's own built in controller by Renogy that I could use on a lot of ot...
In real life scenario they will work - somehow. Work fine - I doubt, unless they are identical, set up identically, and wired identically.
I would add another 100W panel to the roof and upgraded the existing controller (if necessary). In terms of roof space, TC are good for 250-300W total, provided the cable to controller is adequate. For those occasions when you are parked in permanent shade, you can indeed carry a portable, for use when roof panels don't work.
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