I see that my new 80W solar panel is supplied with two 90 cm cables, one fitted with a male connector and the other with a female connector. I wish to run these two cable to a waterproof fitting glued to the roof into the van and then between the inside if the roof and the roof lining to the voltage regulator. As the connections will be made inside the van can I simply cut off these special connectors and make the connections through a standard connection strip or are the two wires individually shielded? What size cable will I need to make the connections between the panel and the regulator and between the regulator and the battery? The total run is just under 4m. I do have some twin 12V cable marked 25 amp. I am not sure of the diameter or cross sectional area. Will this be OK?