question

Hi...you need the 100/50. The 100/30 will not be damaged, but the total output would be less. The pcb assembly of these panels should be considered because sometimes the components may have some kind of output loss if they are of not good quality.
An alternative would be two (one for each panel) 100/20. This is likely to be cheaper (although I have not checked the retail pricing). This option will provide slightly more total power and have redundancy. The drawback is slightly more complicated and expensive wiring, as wires from both panels need to be led back to the controllers.

Thanks for the suggestion, but at this stage I will have to use what I already have, buying a bigger controller isn't a option right now.

Personally I will favour parallel. Use the handy Victron app to assess your configurations under the MPPT Charge Controller section. (You can enter your own PV values.) Exceeding the manuafacturer recommendations could invalidate a warranty. More importantly, check the cabling is capable of handling 22A in parallel as I this is where I would be more cautious. It results in heat and inefficiency or worse if not taken properly into account. Another important aspect of parallel is the start bat +5V to get the charge controller going and if you actually have higher voltages, the charger can actually start earlier and make a day last longer. That is of course if you go serie. The parallel option looks ok for it however and if you use MC4 connectors everywhere, you can experiment quite easily.

If you think there will be tall trees in your camping areas then series probably wouldn't be the best option, to be safe I would only go 3 of those panels in series for that controller . You would get better results if the panels are angled towards the sun so portable panels can make better sense but they are more likely to get stolen or damaged, can be a chore dragging them outside then dragging them back in and storing them securely....

Pretty sure option 1 wouldn't work , if you mounted 3 in series on the roof you'd need another 3 panels wired in series then connect that set in parallel with the roof panels. All 6 panels would need to be exactly the same too. Means you'd need to buy 2 more 100w panels exactly same what you have now.

Another option ( with what you have now) is wiring them in series/parallel meaning wiring 2 sets series then wiring those 2 sets in parallel. So for that you'd probably have to wire 2 panels on the roof ( in series) and 2 made portable ( in series too ). That way you wouldn't overvoltage the controller input at around 45 volts max and the output current wont be an issue , would be max 5.5 amps ( with just 2 roof panels ) or 11 amps max for all 4 panels connected . In theory this will get the max out of your panels using the controller you have. Oh yeah make sure all solar panels are exactly the same specs brand etc if you are going series even its only 2 in series.

In the end if you think shading will be real issue then going the simple method of connecting all in parallel will be best, in practice you would be lucky to go over 18 amps with all 4 in parallel due to cable losses / shading / panels getting hot.

Thanks for all the answers, in the end I'll be going with the 3 mounted panels connected in parallel since the main decider in my case is shading on the panels.

Another question, I was thinking to put a switch between the panels and Smartsolar controller if for some reason I want to switch off solar charging.

Will it make sense to put a switch between the panels and controller or is there a way to switch off the Smartsolar maybe via VictronConnect?

If I do put in a switch, will any switch able to handle say 25V and 25A be fine considering the panels will run around 18V and 18A?