Solar panel kits have to be installed on the roof of your RV not too close to anything that will throw shadows on it.
The solar panels have to be connected together with proper sized electric cables never a gauge less than #6, ideally with #4.
Finally, the cable will run down through the roof of the RV to be connected to the charge controller located in a storage compartment below.
This charge controller or regulator has for function to make sure that while charging the battery bank, it does not get overcharged.
There are two places you can run the wire without drilling a new hole in the roof of the recreational vehicle:
ANSWER: In PARALLEL with proper sized wiring.
and for this reason,
Wiring solar panel kits in parallel will not affect the charging capability of the system if one of the panel is in the shade like it would be the case in a series-wired setup.
With a connection in series, the shaded panel being under a tree for example, will act as a big resistor and affect the amperage of the system.
Connecting all the solar panels together in taking the output cable from one panel and parallel it to the next junction box of the next panel to the next one and so on, would have the chain effect of combining the amperage of each to enter the junction box of the last panel.
This would be a problem since the junction box of a solar panel is only rated for about 15 amps normally. The terminal would simply melt.
For example, four panels rated at an output of 7 amps each, would bring at the end of the chain 28 amps in the junction box of the last solar panel, which is not a good idea.
The solution to eliminate this problem is having a combiner box mounted on the RV roof.
Each output cable from each solar panel is brought to that box which can be rated for 100 amps for example.
The cables are paralleled inside a pair buss bar. From the buss bar two heavy gauge cables (#6, #4) come out to go through the roof to be connected to the controller or solar charger below.
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