With the cost of external portable panels being very low, I would do what I did. I built a low-cost system ($600) with three flexible panels backed with PVC board. I used an MTTP controller from Renogy and bought a waterproof box to house it and even added fans to keep it cool! I have 75' of solar cable so I can place it around the trailer and find the best place for the sun. I have made a carry case that protects all the panels when traveling.
This all plugs into the Zamp controller port in the front of the trailer.
The 300 watts can be used to keep your batteries up while the trailer is being stored inside.
That said, I've now added two more Zamp panels to the roof of my Classic 30 (470 watts) and no longer need these for traveling, but it was a fun experiment to build.
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"At some point, throwing money at the problem *is* the right answer", Uncle Bob
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Tom & Doty
2019 Airstream Classic 30 Twin
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