I believe it's voltage that would matter. Your three panels in series would be a much higher voltage than two in series. Simplest might be to add a separate controller for the portable panels.
Note no experience here, just using basic electrical knowledge.
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Pete and Carolynn Foss from Oxford, MI
2018 Four Winds 31W
1999 Aero Cub F-21 trailer
1977 Tioga 24 foot RV
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