Note that with two 12v panels in series you have to add their Voc to the controller which has a Voc limit. So yours would be 42 Voc.
The older Eco-Worthy 20a controllers work great but have a Voc limit of only 42. Newer ones are 50 but they have the same model number and appearance. Other more expensive MPPT controllers can be 60 or 100 Voc limit or more. Read the specs.
I have tried two 12v panels in parallel and in series on an MPPT controller (Tracer) and it makes no difference in amps to the battery in good light. Supposedly in low light you get more when in series because of the bigger voltage spread between array and battery. No real way to tell if you are getting that or not while camping.
If you get shade on one panel in parallel you still get the amps from the other panel, but in series it kills both panels. Depends on where you are parked.
You will get a trivial improvement in amps to the battery by swapping your existing set-up for an MPPT set-up. I took lots of comparison measurements and posted the results last year and the year before. But if you don't believe that, it is your money! :)
