okay, if you are installing in series, than you will have a 24v array and a 12v battery bank? that would mean that you have an mppt controller. is that correct?
by code, once you leave the area of the modules, wiring is required to be in conduit. once you have the modules connected in series, you would have 1 open positive and 1 open negative on the series string of modules. you would use something like this
http://store.altenergystore.com/Cables-Wiring/Wiring-For-Solar-Panels/15-MC1-Connector-10-AWG-MaleFemale/p4267/that would be cut in half with the plug ends going to the array and the bare ends going through a combiner box, or pass thru box like this:
http://store.altenergystore.com/Enclosures-Electrical-and-Safety/Electrical-Enclosures/Combiner-Boxes/Ready-Watt-Pass-Thru-Box/p6045/this would allow you to leave the "area of the array" in conduit satisfying the code. once you got to the inside where your charge controller is, you would use bare ends to make the connection to it (hopefully with a disconnect before and after on the positive)
practically, any weather appropriate box you can splice in and leave in conduit will do, and yes you will likely have to have bare ends connecting to your charge controller from your array and from your battery bank.
hope that helps,
james
altE staff
